My cats are both outdoor cats. They were both strays, and will not stay indoors. They apperared on my deck one day, and now, 10 years later, are happy and healthy, although one getting pretty frail with age.
That aside, I realize they are in danger of raccons, traffic, dogs, etc. BUT....if someone is harming them on purpose, be it poison or physically harming them, that person is putting him / her self in danger of eating a fist.
Does one shoot a pigeon for crapping on thier car, or even more close to home, do you shoot the nieghbors dog after you step in his crap?
Get over it.