I mean that is wildlife doing wildlife things. Foxes eat prey, chickens fall into their prey category. Maybe my opinion will change if I get extremely active predators, however I have 4 large loud dogs who have the job of keeping predators away and do a great job of it.
And your opinion is...
I live with woods all around me. I would feel pretty crappy killing wildlife because it is doing wildlife things. We have not had any dead chickens yet. But if we ever do I will be sad but the only thing I will do is make my chicken area more secure.