And see here is the problem. If you are RIOT POLICE and you are "on edge" (lol) from getting pelted with bricks, rocks, and frozen water bottles, it's time to find a new line of work. Professional law enforcement don't enter situations like that "on edge" and let their emotions dictate their actions.
Perhaps it's time to defund the riot police and just train the regular police to be less on edge when people throw things on them.
That's like saying soldiers should not be on edge during battle. Have you ever been shot at? Ever had bricks and rocks thrown at you be an angry mob?
They're human beings, not Robocops.