You don’t understand feral cats.
We had one by us, a Tom. It would impregnate our cats. He would not let anyone get close to him. Last I saw him he had an open sore on his neck with a tape worm sticking out of it.
I waited for him for a couple of hours one night until he finally got into range where I could eliminate the problem.
What I don’t understand is why you wouldn’t get “your” cats fixed. Not trying to start something with you, just curious.