I think the best answer is it varies quite a bit.

Some people it is a sunk cost fallacy. They went all in on Trump in '16 as the outside, antiestablishment candidate. They alienated friends and family either emulating him or just repeating his insults. Then once alienated from friends family they found solace in other people who experienced similar outcomes. This only reinforced their ideas that they were right all along. Trump not only winning but being right about everything is the only way they think they will be vindicated. If Trump is right then sooner or later those that cut ties with them will come back. If Trump is/was wrong, then they are wrong and if they are wrong they have lost years with loved ones, maybe the rest of their lives with those people due to their actions. Trump is all they have now and they need him to win/be right.

Others I think are just good old conspiracy weirdos. They may or may not have voted for Trump in '16, but Q Anon or Covid conspiracies or Pizzagate got them wrapped up and Trump is their winning hand. He is their way to unraveling some deep seeded conspiracy where all the bad things in the world are the fault of a few people like Bill Gates or George Soros. Trump is also their retribution for all the bad things that have happened and Trump plays into this saying they are after you but he is in the way.

There are probably a few who are just grifters. They dont give a fuck about any MAGA stuff and only are in it to make a buck. They have now seen how MAGA will turn on you if you speak out like Rogan or Rittenhouse and their only choice is to keep on grifting.

Still others I think are people who are in the right wing news bubble. Decades of Fox news or Newsmaxx/OANN, combined with right wong talk radio of hearing how all Dems are evil or working with the literal Christian devil and Trump is the only person you can vote for. Third party candidates you probably never hear of and if all you see/hear is how good Trump is and any bad things happening to him is the fault of Dems then you have no choice but to vote for Trump. I mean would you vote for someone you thought was an avatar of evil?

Finally are probably the ones who I think literally want to be part of a dictator state. Trump is a means to an end. Project 2025 lays out their plans to usurp the entire government with sycophants. They would weild the levers of power to ensure they never have a serious opposition candidate again. The chants of “lock her up” will be replaced with actions. Anyone even remotely left of them would be in danger of being labeled a radical and in need of being arrested and likely never see the inside of a court room.

Most probably hit a few of these but I think these are the major reasons people are for Trump despite his negatives. I think if you ask people though one of these will likely be the main reason.