Trump could have fired Barr a long time ago already. He didn't.

There must be a reason for that. Why would he NOT fire him in this situation if everything is like we believe it is? Or might it be possible that Trump has more knowledge about what the DOJ is really up to?

Is the public supposed to be informed about every step the DOJ is taking and every investigation they are conducting, even if it is a matter of national security? Or might there be cases where the DOJ makes it look like they are doing A while they are really doing B?

I am trying to find logic in all of this. Either there is logic or it is all meaningless anyways.