I agree with my liberal friends on much, but I don’t agree that Trump is crazy. Better to assume that his style of leadership is related to his past. As a negotiator, he may have found that the strategy of creating chaos and outrage among the people he had to deal with was a good way to set the stage. Flustered, they see him as unpredictable and a little crazy. Meanwhile, he can observe the turbulence with some glee, knowing that he has sown these seeds of chaos and he can now manage his interlocutors from a position of greater control.
For all I know, that is a great negotiating tactic for a business person. But I ask my Trump-supporter friends to consider whether being the U.S. president calls for a different skill set. National (and international) security now rests upon a network of allies, all of whom must be willing to share highly sensitive security information; economic health depends upon an even broader network of formal and informal agreements. Is it possible that “unpredictable and a little crazy” is a good tactic to set up a solo negotiation, but a disastrous tactic where so much depends upon you being a predictable and trustworthy partner?