Sessions has been collecting a government paycheck since 1975... that's 42 years. His first loyalty is to the establishment... regardless of his intentions, that's pretty much baked into his soul at this point.
Making things worse, he has been a Senator for the past twenty years... the swamp creatures in the senate are his "friends". Any attack on Hillary is a threat to all the crooked senators... since she would sing like a jaybird and they all know it. They all have a lot they need kept quiet.
Yikes - his career is starting to get bad eyesight and its back is going.
Way too long