I appreciate the compliment, but no. Not relevant in this case. For one thing, my RT was from before I was seriously involved in dogs. His whole life the only thing I taught him to reliably do was sit, and that one took me SIX MONTHS. Otherwise, nothing - his recall came installed from his breeder as an adult when I got him, and she trained his recall. Via very, very 'pet level' training methods (recall on a long line, periodic cookies, total inconsistency), some punishment for returning nonsense.
So, as much as it'd be nice to take the credit - No, not hardly.
Secondly, seriously, I'm not talking about na individual. I worked closely with several breeders. At one point I co-owned one of Jack's offspring with a second breeder, with intent to maybe breed him at some point to a third breeder. Those breeders were confo,hunting (squirrel) and all the agility (and weight pull and flyball) dogs I know now from different lines. All those dogs, over YEARS and what you are describing has as much to do with a rat terrier as calling a lab as being dog and human aggressive and unlikely to be reliable off leash.
Does it happen? Yes.
Does that make it what the breed is and is supposed to be? Not hardly.
Do rat terriers have prey drive? Yes. Otherwise they wouldn't hunt. Do they have out of control prey-drive on par to most terriers? No.
Heck, go read some of the breed history and info. They're common in dog sports, on farms, and as family pets for reasons and it's not 'hard dog to own'. They're not JRTs, or Parson's. They're slightly more terrier-like than your average YORKIE - they will chase, they will hunt, and they will also chill out calm down and mostly do okay in most households. I'd be hard pressed to find an EASIER dog to own for the majority of households.
Spreading misinformation based on being exposed to what sounds like some radical outliers and/or horribly bred dogs, without a good understanding of the breed? Just isn't cool. It'd be like me saying Cocker Spaniels are aggressive because I keep meeting crappy examples of the breed. Or Danes are all human- aggressive because I keep meeting THAT.