Part of it is probably our harkening back to the Puritans who were too extreme for England. That same Puritan belief also held in it that wealth and success are a sign of God's approval and favor. He's successful therefore he must be godly and all the crassness must just be an act because God wouldn't reward him otherwise.
Largely it's probably because he says whatever he wants and they love what he says. He's openly racist, xenophobic, islamophobic, and the aggrieved poor whites lap it up. If you're too poor to look down on others then at least by being of a 'superior' religion or race you are therefore entitled to look down on everyone not like you.
They have the same sort of 'common sense' approach to government that don't understand that it's actually complicated and difficult business. Therefore when he blames the 'deep state' for everything he fails to do. Remeber this gem that essentially sums up all his difficulties in governing:
https://www.cnn.com/2017/02/27/polit...ted/index.html"Now, I have to tell you, it's an unbelievably complex subject," he [Trump] added. "Nobody knew health care could be so complicated."
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