There is dug in, and then there is DUG IN.
Those who are still loyal to Trump and still react with such outrage to things like the 1/6 hearings and the search warrant yesterday have dug themselves in so far, that pulling back now would short-circuit something in their brains. It probably isn't possible for them to admit they're wrong anymore, just on a psychological level.
And I say this without judgement. I think most of us could look at our own lives and find something - not necessarily in politics, but somewhere - where we were equally invested, and where we just couldn't pull back from it no matter what the evidence to the contrary.
But this is going to be a big problem for America. When we have a President who millions think should be above the law - and who will support dismantling the FBI if Trump ever does get back in power - it's a real issue.