IMO he resigned because his job is done and he’s trying to distance himself to provide that GOP-beloved questionable deniability. He doesn’t believe there will ne violence; he *knows there will be violence. FFS at this point every American should know that there is going to be violence; they aren’t exactly being quiet about their intentions.
Remember: believe the autocrat.
And Mr. Wolf has now done all the harm he can plausibly do, I suspect, without outing himself as an active participant just by being “in play” and so he is seeking some cover.
How much about the Inauguration security plans do you think he knows? Who might he communicate with in the next few days?