I’d be taking them to see someone in the mental health profession sooner rather than later.

I wouldn't ruin my body with kids, but if I did, I'd probably send them to a therapist and homeschool them till they're no longer a danger to anyone else.

That would make me very sad and fearful that it would be my fault and I would research the reasons and causes and would talk long and repeatedly with my child. Also I would talk to teachers, friends and peers of my child. If unsolvable I would seek professional help too

Professional help

Depends on the age tbh. But it would vary between disownership and stern words and finding a hobby then helps them healthily vent.

Try to explain to him why he shouldn't hit people and such. Maybe threaten to take away his things or something. What else can I do? If he's just an all-around asshole maybe I'd give him away... I don't want to raise a child I can't love. =/

I'm not sure what else to do but get them professional help, unfortunately government/social services will not get involved here until it's much too late