His sudden recusal barely four minutes into his job, without first discussing it with the president, was a big mistake. Weak, very weak.
Absolutely not at all true.
He was a major player in the campaign. Maybe THE major player in the campaign. For him to investigate that campaign would not have been believable if he found 'no cause'.
And if he in fact indicted with cause, you;d be more pissed than you are now, and he'd have been even more a traitor (in the minds of Tump true-believers).
No, it was the exact thing to do, and a principled thing.