I did not vote for Trump in the recent California primary. But I can understand the anger that fuels his candidacy.
For over a quarter century, Trump's supporters have been dismissed, ridiculed, and shut out by the ruling class in this country, from politics to academia to the media. Their jobs have been exported to third world countries, and those that couldn't be exported have been filled by compliant and disposable third world immigrants, either illegals from Mexico and Central America or semi-skilled laborers from India on H1B indentured servant visas. They've lost their homes and retirement funds while Wall Street crooks have gotten rich. They haven't seen a real increase in their wages in decades. They see American soldiers coming home in bodybags and terrorist attacks for fifteen years, and the ridiculous explanations for the "why" have ultimately come down to Islam being an evil religion that needs to be eradicated, at the same time the political class is insisting that America needs to import millions of Muslim refugees. Popular culture manufactured by the media hipsters in LA and NY openly mocks and ridicules "traditional" American culture of 'flyover country'. They're told their daughters just need to get used to sharing bathrooms with grown men. They hear they need to hand over their guns to a government that is itself armed to the teeth and views them with contempt at best. The 'Trump supporters' have finally had enough, and aren't going to take this any more. They have rejected the conventional social/media/political establishment which has clearly failed to represent them.
If the popularity of Trump is surprising to you, you haven't been paying attention. The media has gotten so good at pitting demographic A against demographic B that the rise of a Trump was inevitable. He has embodied the fears, concerns, and troubles of the reactionary foils of triumphant progressivism. Trump has become a lightning rod for the discontent of scores of political groupings, representing tens of millions of people, which have been dismissed as backwards, 'racist', rural, and fringe by the hopelessly out-of-touch cognoscenti for decades.
All of you who are shocked by Trump supporters today have dismissed these people and demanded that their voices not be heard. You had your way for decades, keeping a lid on the cauldron by shutting them out of the public sphere. Now that cauldron is boiling over, and those decades of concerns - exacerbated by the feeling that they've been silenced all these years - is coming out, and no one - not even Trump - will be able to keep the lid on it.
To quote John F. Kennedy, "Those who make peaceful change impossible make violent revolution inevitable." For many, Trump is the last grasp at "peaceful change" - a candidate who publicly sheds the standards and assumptions of the ruling class. I fear the inevitable disappointment a Trump candidacy will result in (either because he is a social liberal, crony capitalist, and political insider who has through his acting and showmanship skills alone is successfully riding a movement that is in opposition to all three, or will be defeated by hook and by crook at the polls in November) - will mark the beginning of the second half of that truism in America. And it's not going to be pretty.