I don't think it's comprehensible at the individual level, but at population scales even the worst leaders tend to maintain a sizeable level of support. Trump and Chavez have alot in common[1], and nearly half of Venezuelans still supported Chavez at the end, when Venezuela had already been wrecked. Even Maduro had double-digit support in the last election (nominally 30% but probably less in reality). Cult of personality is a powerful thing, and can linger even after the personality is gone. I wouldn't expect MAGA to disappear overnight.

[1] Does this sound familiar? https://www.caracaschronicles.com/2003/12/03/the-cornered-na...