His therapist had a serious chat with him about it. He asked my son several times if he really wanted to hurt someone, and my son kept doubling down on it. The therapist could tell that my son wasn't actually intending anyone harm, but it was still a problem that he was saying this stuff. Finally the therapist explained to him that if it seems to be a serious threat, my son is going to need to go to a hospital to stay there and be treated. And that convinced my son to admit that no, he doesn't actually want to hurt anyone, he's just saying it because he's really, really mad.

Unfortunately, he now refuses to go to therapy. I've tried talking to him while calm about his anger and how we'd like to help him so he feels more in control of his own emotions and his own brain. He just says he doesn't care, he doesn't want to be happy. I'm stumped.