Did anyone bother to ask the cats?

Every year millions of cats are put to sleep to save them from a life of wandering the streets scrounging for food. I can tell you one thing, I'd rather be homeless than dead, and I'm sure that if you could ask the cats, they'd agree.
I gotta say that every cat I've ever seen running the streets seemed pretty happy to me. Hell, I gotta slide out the door sideways to keep my cats from getting out.
I can't understand how a society that argues that its the humane thing to do to kill a perfectly healthy cat can't afford the same courtesy to a terminally ill human. By that reasoning we'd be doing homeless people a favor if we declared open season on them. But although a cat deserves a good home and steady meal just as any human, a sick human doesn't have all the rights of a cat. That would be immoral.
If a cat is born into the wild, lived all its life in the wild, isn't that cat a wild animal? I mean we don't round up all the poor homeless squirrels and slaughter them wholesale. No, we give them nuts. To me a wild cat is nothing more than a giant squirrel that doesn't like nuts. Maybe instead of rounding up homeless cats for slaughter, we should just go to the park and throw sardines around.
I guess the biggest question of all is: How the hell did all these animals survive before we got here?