In his superb book, "Destined for War," Graham Allison speaks eloquently to the issue of a leader mad with power. While he was speaking about Bismarck, the very same description can be applied to Trump who "....provides a textbook example of exploitation of the ruling power syndrome; taking advantage of exaggerated fears, insecurities, and dread of changes in the status quo to provoke a reckless response."  This is why Trump tweets.  Trump knows he can play upon the honor, interests, and fears within his base to keep them fired up and angry - -  all the while distracting them from the truth while he consolidates his power.  Trump is supremely dangerous to us all.