It's a personality cult. Read Eric Hoffer's True Believer. One major finding is that its easier to switch from one true belief to another, than to lose that belief. The Christians have switched from Jesus personality cult to Trump personality cult. Both characters are liars, charlatans, and essentially fictitious compared to their public persona. It keeps their gullibility intact and there's no expectation of actual thinking; Perfect.

First, it’s not conservatives who are refusing to acknowledge Trump’s crimes, it’s religious Republicans who are refusing.
Second, America has never been a democracy. Alexander Hamilton and the Federalists in the 1787 Const. Convention created a plutocratic oligarchy.

As you say, Trump is clearly guilty. His base is supporting him because they believe he is bringing the end times in which they will all go to their heaven. They don’t care about America’s future.

I think the only thing that makes sense is that they're all being extorted in some way or another, whether it's dirt, or threat of pulling political funding, or whatever.

he is spouting lies telling them he doesn't believe in abortion and cutting immigration and as long as the congress gets paid they could care less and texas has the lowest of the low

Precisely because they are Philistines, who will defy logic, and defend their wretched ignorance to the bitter end. I once overheard a Philistine describe himself as being "comfortably dumb". That is an understatement for all of them!

They have backed him and they can’t switch horses now. They want to stay in power and they see his re-election as the only way they can do that....they will turn a blind eye to anything to do so.

Because they passed being sane and hit cult status a long time ago - trump realized it with his "shoot someone on the street" remark way back in '16.

They are afraid of trump and his control of the Republican base and they want to hold on to the power. It is that simple.