Many people have remarked how senseless the raid on the Capitol was in terms of achieving the assumed objective of somehow forcing them to hand the election over to DT.
Very true but I don't think that's the reason why he chose to foment the mob.
What he has seemingly managed to do is put the US government in one hell of a rock in a hard place.
If they don't impeach him then they have set a new and disturbing precedent that effectively says "If you're POTUS and want to do as you please, no problem, just wait until there's "Only 13 days left" and then have at it - incite insurrection, commit treason, destroy the Capitol, terrorize elected leaders - no problem, you won't get impeached" (you can blame it on being "mentally unfit"). It also sends a message that we (USA) will tolerate such behavior unpunished . . . . .under certain circumstances, and therein lies the sucker punch.
Those certain circumstances would be, as has already been stated by those in opposition to impeachment, for cases where doing so might create more harm than good in the long run. So, he has managed to create enough fear and dread to force this most uncomfortable, and outrageous situation. This would be like the courts saying to someone like Charles Manson, "We're not going to punish you for your crimes because you have so much influence that it would cause more problems than prosecuting you would solve" (so uh, have a happy mayhem and murder spree at your discretion). And you can bet your last dime that his followers are watching the outcome of this with sharp eyes trained on the bottom line verdict where no impeachment sends the message that they were in the right as "the chosen ones". (ie a victory)
I'm not going to pretend to know who was who among that group that stormed into the Capitol because it is already clear that there were many different stripes there unified under a common cause. DT loves chaos by his own admission, so the bickering over which groups were there and which weren't is playing right into that trap. Stay clear of that in order to remain objective.
From what I can see, this is all about the one thing DT has always been highly skilled at - gaining leverage over a situation. If he is not impeached then we (assumedly) get less protests according to the reasoning of some, but he is free to run again in 2024. If he is impeached then he is peculiarly free to pursue other goals and free from the obligations of mounting a 2024 campaign which his supporters would be expecting. But, it's those other plans and goals he may have that are most worrisome at this point but that's another discussion topic. A rejected ex-POTUS in exile could be a dangerous thing to the USA.