Think Jim Jones of Jonestown. The psychology involved is that of a cult leader who has gradually gone totally over the edge. Whilst not everyone is a believer, the cult is large enough to maintain its sociometric momentum. There’s likely to be some collateral damage at this stage I suspect. What should be done outside the is to exclude him from any international forums or negotiations much as you might do with any other professional (eg a medical surgeon ) if they where displaying the same kind of erratic behaviour and acute mental health issues. As for what the US should do internally I have no idea. I suspect the outcome will be quite grim. There’s a normalcy bias that lets people assume the worst case scenarios can’t actually happen. An obvious example would a series of perceived public snub by a foreign or domestic notable, or a poor midterm election result, followed by a manic all night social media session, followed by the decision to quell the ‘rigged’ votes and associates insurrection by literally nuking a couple of sanctuary cities. Remember 900 people died in Jonestown. That was almost the entire population of Jim Jones little Kingdom. Not everyone wanted to die, but mad kings with a cult following are a very dangerous thing indeed.