The first thing to attack my chickens were raccoon. They came in at night and caught two of my chickens. I woke up hearing their cries but by then the raccoons had taken them. The next attack cam a week later but this time we were prepared, the lights and shouts drew them away. I then called in a raccoon removal service ( www.removethewild.com )to take them away. After that there were no more raccoon attack. Foxes did try to sneak then, but by then we had build higher fences and had guards so they couldn't do any harm.
I would never support killing, even the raccoon removal service I hired were known for their humane animal removal methods.