The main problem imo is that he’s surrounded by yes-men who probably also somehow make money off of his behaviour. His self destructive tendencies are already quite dangerous to everyone around him, but it’s even more dangerous if everyone in your personal sphere affirms this behaviour. At some point you’ll start to believe that you’re in the right.
He needs good therapy and meds, but maybe it’s already too late for that if he’s not willing to accept help.