Most of the republicans I know are disappointed, but not so severely that they want to go killing people. That sort of extremism is very fringe. Also, even if you count the mellow majority, they're far from 50%.
It's not.
People telling you that this time it's going to be a war or coup are trying to scare you. In retrospect, you will probably laugh at trump for being such a pathetically poor loser, and laugh at yourself for worrying about it.