I have racoons and possums frequently around the house. Sometimes eating the dogfood outside lol. So far they have not posed a problem to my chickens since I went with 1/2" wire on everything.
Before once I did have an issue with a small Chicken Coop I was going to use as a grow out coop for silkies. It just have chicken wire around it and a raccoon reached through and way the heads off of all my chicks. It was sad but I did not get mad at the raccoon. It was just doing what it's nature was telling it to do. I can definitely understand people killing them if they are causing issues or moving them to a new area but so far I've been able to live in peace with the predators around me.
That said I only let them out in the day when I can supervise them and lock them back up before I leave or go to bed. I know not everyone can or wants to do it that way. If I was to free-range all the time mine probably wouldn't last a week. Lol