When NYC put 7000 police officers on extra duty, put up barricades, but the Trumpsters failed to show up. The made for TV, staged fiasco of 100,000 snarling Trump fans crashing police barricades wasn't going to happen.
The optics of no one showing up for the event would be even worse.
Trump also deferred all responsibility to Pence.
Trump pussed out, told his supporters to protest and then split, and blamed Pence for why Trump bitched out and allowed mass scale scam mail voting and never took charge of the fucking justice department and let jews run the fucking nation into the ground.