wow this is Boston Chinatown, my martial arts school is a block away from there...
but yeh it doesn't matter where you are from, if the cop's only job is to patrol the night, they haven't seen these violence before in their life, to pull their guns out without thinking is impossible, cuz once you pull out the gun, even if you don't open fire, it will scar them. Open fire or not, the moment they take their gun out of their pockets they need to see the psychiatrist.
only cops who have seen those scenes or experienced them would pull out their gun with no problem.