If they are waving a non U.S. flag, smoke em.Whats the ROI for the Marines? Empty well? Empty mag in well? Empty mag in well live ammo in pouch? ETC, ETC. If actually armed under what circumstances can they fire?
This is not a "peaceful" protest about some war; it is alien invaders trying to take over U.S. land by force, smoke em.
Run a national statement that at 6 am PT if you are in the crowd you will be shot; smoke em.
Arrest the gov. officials or shoot them depending, if the are helping the enemy.