The issues with these MAGA idiots are too complex to simply generalize.
But I think it's safe to say that the segment of MAGA that isn't comprised of greed motivated wealthy a-holes, is mostly comprised of low educated losers who are frustrated because they aren't part of the aforementioned segment.
They are losers by virtue of not having many or any of the things most commonly associated with success in America.
Specifically... high income, attractive spouse, big house, expensive cars, plenty of leisure activity, etc, etc.
So naturally they either blame the left for their own failures or otherwise take it out on us by putting scum like trump in office.
I think the deep-seated, underlying logic behind supporting trump, is that if they are forced to live miserable lives, they're going to do whatever they can to cause everyone else to live miserable lives.
And in doing so, they are finally at last, realizing "success" at something.