Well, I was trying to stay out of this, but I do feel I have a little bit of insight as an American living in Scandinavia. I think there's a bit of culture clash going on here, because in my experience (which is, to be clear, with Norway) Scandinavian dog culture is
very different from my experience (again, mostly urban and suburban New England) US dog culture.
1: Many, many more people in the US rent. This means smaller living spaces for everyone, and small apartments can be incredibly difficult to puppy-proof, especially studios with very few actual enclosed rooms. It also means that minor damage that wouldn't be a big deal to the dog owner - scratches in the door, some puppy tooth marks in the baseboard, stains on the carpet - can become a big deal if the landlord objects. It can also be incredibly difficult to find dog-friendly housing in some regions, especially if you have a dog over 20lbs/9kgs or a 'notorious' breed, so the threat of having to choose between your dog and a roof over your head can be very real. Saying nobody who rents can responsibly own a dog is a vast oversimplification and flatly not true.
2: US work culture sucks. Not for everyone, but in general. Calling off sick is highly frowned upon. Vacation time is scarce, especially if you have to work multiple part-time jobs due to the tanked economy. It's certainly not normal to get 2+ solid weeks off every summer, as it is in much of Europe. And losing your job means losing your health insurance in many cases (yes, Medicare exists - for now - but it's rife with issues). Flexible hours, working from home (until recently), and/or a dog-friendly workplace are rare commodities. Taking time off for a new puppy is a wonderful thing to try to do, but it's just not always feasible in the American work culture, and again, it's simply not realistic to say nobody should own a dog unless they're retired, a homemaker, or have the luxury of lots of time off stored up.
3: The US is much less dog-friendly. Tying into the above, you just can't bring your dog a lot of places compared to what I've experienced in Norway. I suspect some of it has to do with how litigious US culture is - for example, many workplaces ban dogs to avoid the risk of being held liable if someone gets bitten. Many landlords ban dogs because it raises the insurance premiums for their properties (since that insurance is what would cover a bite or major property damage). Taking a dog that has a SRP (separation related problem) or is just a teething puppy with you is just not possible many places.
4: Dogs are incredibly easy to get in the US. That's not something I see as a good thing, btw. But irresponsible pet stores, retail rescue, puppy mills and brokers, and legions of backyard breeders mean that many more dogs seem to be impulse purchased in the US than in Norway. No, I don't have statistics on that, it's just the impression I get. And yes, Norway at least still does have irresponsible breeding going on, but nowhere near the volume the US experiences. This means that many people ARE unprepared for a dog when they get one, which sucks, but we can't realistically tell them just to give the dog back. We can educate and educate until we turn blue but right now we don't have a good solution here, and many commercial dog breeders learn how to talk a good game to avoid sounding like the mills they are.
5: The homeless dog population. Whoa boy, the homeless dog population. When someone DOES wind up with a dog that they're not prepared for, or one with an unexpected SRP or way more energy/drive than the home was prepared for, they can TRY to rehome. But very often, especially in the case of socialization/separation issues, there are precious few homes willing to take on problem dogs. While I greatly dislike the idea that you should NEVER EVER rehome a dog for ANY REASON, Americans still need to understand the reality where, if these dogs go into the shelter system, the chance that they'll make it out alive is slim to none. And in some cases, they can languish for years in kennels waiting for someone willing to take on their worsening behavior problems. Keeping the dog in the home they have is important in these cases, even if that means using less than ideal management to work through issues, when the alternative is a life wholly in high-stress kennel environments or euth.
I'll be honest. I crate very little. Tried with our older dog, and found that he was much more comfortable (and less distressed) being left out, first confined in our bedroom (which was relatively dog-proofed at the time), then the apartment. Now, he was my first dog ever and my wife's first dog as an adult, so the training there was lacking. Our youngest got crated at night for a while, and now rides in a car crate, but we went the pen route for his day-to-day confinement. We had the luxury of having an apartment that, while not feasible to puppy-proof, did have space to squeeze a pen in. It did require me to be willing and able to do several things that wouldn't be an option for everyone, including screwing the pen into the wall so the puppy couldn't shove it all around the apartment and get at things that weren't safe for him (almost all of the apartments I lived in in the US frowned greatly upon putting holes in the walls for any reason). Which he did even after a good month I had at home with him doing pen/separation training before I had to start attending school in person again.
But that was my choice, for my situation. I can't really judge someone for going with a crate instead. I do believe that the goal with crate training should ALWAYS be to reduce the time spent inside as soon as safely and feasibly possible, but understand that this is much more difficult with some dogs than others.
We do a lot of things that impact dogs' natural behavior and can negatively impact them in the name of keeping them safe. Collars can cause damage to the trachea, thyroid, or even neck vertebrae. Harnesses, although responsible for fewer acute issues than collars, do restrict the dog's natural movement and full extension of their shoulders. Leashes are entirely unnatural and cause many dogs issues when greeting other dogs because they can't express natural body language.
Perhaps more pointedly, we no longer just let our dogs out the front door to run loose in the morning and let them back in at dinnertime. Many trainers who were active in the 70s when this was popular (at least in the US) report that dogs then had many fewer issues with understimulation, lack of exercise and related issues (eg obesity), and dog-dog social skills. That doesn't mean that confining them to fenced areas, leashes, and long lines is cruel, but it does mean we have to consciously change how we interact with our dogs and ensure their needs are met. I personally feel the same about crates. They can be used cruelly, but with appropriate mental and physical stimulation, the downsides can be balanced. Like Canyx, I want to reach a place where they're not needed, and pens (at least) are more popular and more accessible, but we're not there yet.
I'd also - and not trying to be snarky here, this is genuine - really want to know how you would manage a dog with genuine separation anxiety that requires both pharmaceutical intervention and training, who will seriously injure themselves if not restrained, during the period it takes for the medication to on-board and then the training to be effective (which can quite literally take months), if you have to work outside the home to afford the dog's treatment? This is one of those 'no good solutions' scenarios that always bothers me, so I'd love to hear what your take on it is.
Oh, and about the PETA thing. It doesn't matter if the article has good information. By citing them you imply that you find them a generally good source of information (whether or not you do) and agree with their overall mission (which is to end the keeping of all animals, domestic or otherwise, including euthanizing those that can't survive in the wild), and their practices (like financially supporting domestic terrorist groups like the Earth Liberation Front and the Animal Liberation Front -
here if you're interested). It undermines your credibility in a debate, even if the article is technically factual. It'd be kind of like if I said "Cesar Milan says it's important to exercise dogs" - the natural assumption is that I'm citing him because I generally agree with his training methods and philosophy, which I do not, even if this is one case where he's generally correct.