Crime

You're absolutely, completely right.

I think he might be an honest-to-God sociopath with zero empathy for other living things, perhaps due to a big hit to the head or just born without this capacity... When someone has this condition, their only hope is that they develop an intellectual respect for the principles of justice, or become devoutly religious and committed to those virtues. Even then, as you say, they are not someone you want to be around at all because the normal emotions that would make any of us stop from using extreme violence are missing in them...

What he did to that cat is absolutely insane. It overwhelms me...

And what mental health support is he really going to get..? Little to none. It's going to be grandpa carrying the weight...

Honestly, it seems hopeless, but I pray there is someone who can help him turn the corner on his mental health issues... mostly for the sake of all the people who will ever have to interact with him.

It is a famous fact that serial killers often start out on animals. I certainly hope he's not headed down that path.