That's the mystery to me.Agreed and it's a phenomenon that will become the subject of hundreds of doctoral and master's theses over the next century.
My guess is that it's not as much the MAGAts in Congress supporting Trump as it is them fearing their own White Nationalist constituents and losing their jobs. AKA being primaried. Trump used this tactic in the 2018 Midterms even though it cost him the House and all the MAGAts in Congress took notice.
On one level, I can understand how someone could hold their nose and reluctantly vote for Trump.
But what befuddles me is the cultish loyalty to Trump. You have MAGA morons on JPP who have devoted eight years of their lives to defending and running cover for an unethical sleazebag.