Malarky.
The left made up about 91% of the so-called improprieties and most of what was left was minor or insignificant. Pruitt’s big mistake was trusting anyone.
It seems a lot of President Trump's team messed up once. The ones who are leaving for unacceptable behavior, it's more than once.
He expected to find some camaraderie among employees. Serious mistake. He ought to have built personal relations among WH staff and treated his employees at the agency as enemies of the state. Had he done so he would still be there. Or not. It is reasonable to assume he could not tolerate the constant bombardment of hate pouring out of the agency. Some doses of Trump's rhino skin oil are an important part of the kit for running some of these agencies.