Not much else he could say. He needs the loyalty of the rank and file if he’s going to be able to do his job. The bias evidence I’ve seen concerns a few Trumphaters in the senior ranks and on Mueller’s staff.
Of course Sessions could and should have said more.
He could have reassured Americans these agencies WILL be fixed.
He seems to not understand there is a problem.
Therefore, he sees no need to reassure Amercans.
Back in the old days this would be called a coverup.