You don’t have to monitor all 75 million. As the Nazis demonstrated, you put the first group up against the wall and shoot them, and the rest of the town falls in line.
There’s a story here on FR about a guy who got harassed by TSA multiple times during a trip and one agent finally told him it was because facial recognition matched him with someone on an FBI/Homeland Security Capitol Riot wanted list.
How many others (clearly not you) will be dissuaded from attending another rally in DC?
Do you have a link?
The next “rally” in DC might be a far different affair than the first. The speed with which the monsters are moving coupled with their apparent sense of invulnerability may work in favor of this.