He wasn’t hired to protect Trump and family from themselves.
Oh, BS. Sessions walked away from the position damn near on Day One and has spent his time since then occupied with refighting the "reefer madness" drug wars of the 1980s. Trump and his family have not engaged any illegalities that needed Sessions to protect them from. Nonetheless, the now Democrat-controlled Justice Department has made it their primary mission to hobble Trump's agenda with endless investigations that continually move the goalposts.
As Attorney General, Jeff Sessions has been a profile of cowardice.
He left the executive branch wide open to persecution and prosecution.