Strange cats are pests to farmers, if you already have farm cats. They'll mess with (even kill) your other animals, shit up your structures, fight with your cats, breed like crazy, etc.. If it's at this point, they're overpopulated in the area... and it sucks to have to do it, but they gotta be dealt with, and the envirocunts won't adopt the 4,000 cats that end up on your property every year. Sometimes, part of life involves killing things. So long as you don't relish it, you're not a "bad person" for slaughtering food animals or shooting vermin of any variety. Most people in current year have grown up so insulated from the act of killing *anything*, they'd be horrified to read that you have to shoot cats regularly. They won't understand- because their cat, Mittens, is so great and sweet, how could you shoot a cat?! They don't know that it's not Mittens rolling up on your property. It's a mangy, flea-ridden, possibly rabid 5 year old stray, fearl, missing both ears and most of his tail because it's been in so many fucking fights, and it's not looking to be cuddly with anything except for the guts of whatever it can sink its claws into. The resources involved in calling someone out to your property to "rescue" one of these every time one shows up would be astronomical, so you do what you have to do. The smart ferals will stay away from your shit. This is nature, this is how it's always been, and will continue to be.