Trump has only had a few years to get the lay of the land. This really isn't an easy job when the government itself is full to the rim of enemy agents.
Barr, for example, was the Bush fixer AG who buried the truth about 9/11 that had been apparent to Trump there, on site, from the very start.
There is no way he didn’t know all that.
And years in with so many of these guys, even if he hadn’t realized from the start, he certainly would have recognized it long before now.
He instead consciously decided to go with the GOPe swamp creatures, such as having a swamp creature from the RNC selecting and approving all staffers from the start. FFS he toasted to Bill and Hillary Clinton at his inauguration lunch!