Guilty verdicts are coming in now in the Oath Keepers trial (the militia leaders that helped plan and carry out the attack on the capitol.)

Deterrence (a theory of punishment) doesn't usually work (I did the research for a published book; the DOJ studies concur.)

Incapacitation can work, but temporarily (sentences are limited, inmates get hardened, etc.)

Luck in timing: Just as Trump needs another insurrection, the leaders of the last one are in court.

And they know he didn't help them.