Trump supporters had every right to be angry and frightened. After the financial crisis hardly any of the crooks that caused it went to jail and the ones that were just stupid wound up bailing out with hundreds of millions of dollars as a reward for their incompetence. But people in the middle class lost their houses, their homes, their life savings and their jobs. So they said enough is is enough. This election I'm not going to vote for anyone from the establishment. Both the Republican party and the Democratic party tried to nominate a tried-and true(?) old guard established politician. Unfortunately for our country and the world, only one party succeeded.
I voted for HRC, but it's important to understand why others did not.
Other posters have already noted that had the Democrats nominated Senator Sanders we would have had a Democratic president (and I think we would also have had control of the senate.) Alas, Democrats took a tremendous gamble and lost.