If you are right then Sessions is the worst kind of devious Swamp Weasel because he latched onto Trump’s campaign early on as a faux-supporter in order to get himself into this position.
I think that Sessions was a true Trump supporter during the campaign. After Trump won and the swamp media and government types started putting the screws to him, Sessions may have become afraid that something in his past (or that of one of his family) would be exposed if he went after anyone in the previous administration. No one had to overtly threaten him. He knows about the left ruining people lives, even if they don't Arkanside them.