The difficulty for Sessions, Trump, and anyone in a senior political position during a crisis is that the demands on one's time, attention, and energy can be overwhelming. Many mistakes and oversights flow from that, with over-stressed, emotion-driven decisions all too common.
I have no doubt near everyone inside Main DOJ hates Trump. His AG has a basically impossible job without the support of the GOP on his flanks. Time and again we have seen the GOP refuse to provide its constitutionally mandated oversight fuction and breath life into The Resistance (TM). The bipartisan nature of the ongoing coup causes at best gridlock at DOJ and at worst open sedition.