..because never in the history of law enforcement has a police officer said, "I'm sure it's all just a misunderstanding sir. Now if you'll just come down to the station with me, we can get it all cleared up."
The demonstrators are about to get owned.
I'd guess a few of the "professional agitators" will put on a show while everybody else will go home. Can't have those teachers losing pay making court appearances now, can we?
The Korean National Police Riot control teams have this down to a science. They have their methods of targeting the leaders in a mass crowd, and quickly removing them as things escalate. Like the mindless borg that they are, once the leaders are taken out of the picture, the remainder of the crowds are relatively easily dispersed.