Thanks for caring, but check the dates of the poster. This post was from 7 months ago.
please get the cats to a safe place; it's unacceptable that they may be hurt that way.
Agreed. Don't leave him alone anymore because it's pretty clear that there is a tremendous lack of supervison here. He isn't old enough to be able to be alone with no one keeping an eye on him. When you see him going over to the cats, stop him, obviously, so he doesn't hurt them anymore.
Your cats are going to be traumatized and will become distrustful and possibly aggressive as a result of being treated this way. Maybe you need to consider giving them away to a loving home where they won't be abused like this.
At 3 1/2, he knows he's hurting the kitties, that's why he's doing it. I can't imagine the amount of flailing and screaming a cat would do in that situation.
Who is supervising him? This would take a while to do, and would be a very loud process. I think the first step is to have him supervised by an adult who is within shouting distance.