There are as many answers to that are there are Trump supporters I know. These aren't stupid or evil people, and I don't think its as nefarious the things you are suggesting, at least in most cases. On the other hand, as I sit here and try to answer your question, I can't come up with anything that paints anyone in a very good light and I just end up with more questions.
Ultimately I think there is a common personality trait that allows a person to rationalize pretty much anything. And I think most people have that personality trait. Maybe I do for all I know.
The exchange in Hemingway's For Whom the Bell Tolls always comes to mind:
“But are there not many fascists in your country?"
"There are many who do not know they are fascists but will find it out when the times comes.”
