It has and does. I read a couple of articles about school mass shooters. It said they started out by torturing kittens, but it got old so they moved up to people. If you'd like the links, I'll try to find them.
Thanks but I’ll have to pass on the links. I couldn’t bear to read about kittens being tortured to death, though I know it happens. It was your term, ‘bloodlust’ that really caught my eye. Once a person starts sating their bloodlust by torturing animals to death, it really does become a progressive thing. The same level of cruelty that satisfies at first doesn’t continue to satisfy indefinitely.
I wouldn’t trust a child to the care of an adult who tortures animals to death, or who gets a charge out of watching animals being forced to kill each other. It’s a dark side of human nature that needs to be tamped down, and the alternative is definitely dangerous.