Much of the domestic damage can be prevented or mitigated by Congress; it's President Trump's relatively free hand in foreign affairs that ought to scare the bejeezus out of everyone. 

Think about it. The same mind that believes Obama wire tapped him, will have the final say in dealing with North Korea...we ought to lose sleep over that. Then remember that Trump's big-bad-successful-global-trader China (ergo, enemy #1 in making America Great Again) must be taken into account while dealing with North Korea, and we all ought to be suffering from perpetual nightmares.