Trump's “stolen election” lies played a major role in the J6 attack on the Capitol. Was he involved in planning and directing the insurrection? I don’t know. None of us know the details of the evidence that has been collected. Perhaps it’s minor, perhaps there's one or two bombshells.
At a minimum, Trump is just another egotistical asshole who knew how to feed into the rioter’s hatreds and fears...it's the people he's pandering to that are the real threat to democracy...and those that enable him....