It might be kinda an edgy nihilistic view of the situation, but if he did end up offing himself it might be for the best. If hes so out of his mind crazy that he refuses to get help, is uncontrollably delusional, is a massive drain on everyone around him via his erratic actions, and there is no conceivable way to ever fix the problem due to the fucked up american system of dealing with mental health, then maybe peacefully ending it all might be the best option to cause the least amount of harm to not only others, but to end whatever miserable mental prison he is trapped in. I'd rather see him be helped personally and fix whatever lunacy is going on in his head, but I begrudge no one for choosing to end their own lives in order to cease an active suffering, if they believe that is the right choice.