The first couple of paragraphs in Sessions' letter are about Sessions' recusal. The third paragraph(the resignation offer subsequent to his recusal) and beyond do not bolster in any way Sessions' arguments that he tried to make in his first two paragraphs about his recusal.
Sessions never should have recused himself. Sessions was the Attorney General. It was his job to first determine if these investigations had merit and if these investigations involved himself. Only then would he need to recuse himself if these investigations had both merit and involved himself.
But the Comey investigation was baseless and the Mueller investigation was baseless. There was no reason for Session to recuse himself. He should have never let either of them proceed. He recused himself and let the Deep State Mueller investigation destroy lives and waste valuable time.
Defend Sessions' recusals if you like. I won't. He was too afraid to stand up to the Deep State. A person like that never should have even taken the job in the first place.
My mindless spam fights your whiney blabbity blah blah. And my mindless spam emerges victorious.
Defend Sessions' recusals if you like.
Oh, I have your permission to have an opinion? Thanks, gramps.

Spot on!