I grew up with a kid who was constantly torturing cats and kittens, setting them on fire, hanging them off telephone poles by a jack knife through the tail, blowing them up with cherry bombs, etc. We smaller, younger kids were petrified of him. He had a long and honorable career in the local fire department and is now retired. My skin still crawls just thinking about him... When I was in High School in Ohio, I was the photography dark room partner with a guy who would kill animals, skin them, bleach their bones, and photograph their skulls on sticks in his backyard.
He was eventually murdered in a prison bathroom while he was serving several life sentences for murdering and eating 17 young gay men.