I am glad you did this, although I don't condone breaking the law.When I was little, my family had a neighbor with a small defunct farm. He was elderly and his "farm" was mostly a big mud hole. He had a bunch of feral cats living in his barn and every year they had several litters of kittens. And you know what this guy did? He collected them in sacks and drown them. Over and over again. So when I was twelve my father and I put humane cat traps over there at night and went back at 3am and collected the cats. Then we took them to a vet (we had to find one who would handle feral cats) and got them spayed and neutered. We had to do this five times before we got them all.
I know someone who always has a barn of kittens.They aren't feral (or hadn't gotten that bad the last time I was there... but that was a while ago). I rescued two kittens from this barn. The problems I had and am still struggling with are endless. These kittens have so many genetic and just plain medical issues, it drives me up the wall. I wish someone had trapped them and got them spayed neutered.
What do I say when someone tells me they want to breed?
It depends on who it is. If it's some random person at the grocery store, I don't waste my breath. The average BYB that you meet at the grocery store won't even listen to a word you say... and if they did probably would have no idea what you're talking about (c-section...what?! dogs need those too?... back yard wha?!?!.. pet overpopulation?!)
However, if it's someone like a close friend, or family member... I tell them the story my father told me about the time his parents wanted to teach him and my uncle about the miracle of life by breeding their Boston Terrier. Long story short... the two puppies were born inside out... my uncle decided he didn't want to be a vet after all, and my dad was traumatized for life. (I will go more in detail when explaining this to someone wanting to breed... maybe add some details if I think it might help).