I was a nice guy too towards animals when I first got here in rural MO. Not PETA like though.
Once you get a taste of what varmints (dogs too) can do, you smarten up.
Ditter, regarding the reach, grab and tearing of necks, I learned the hard way on that too. Had some young guinea hens in a steel dog cage left outside. This is to get them used to your property so they won’t leave. Over a few days you let one out at a time everyday. Anyway, before I let any out, same thing as your friend - found them dead, heads pulled off. Coons are blessed with killing skills.