The last time police used force they used tear gas and rubber bullets, without warning, against an entirely peaceful demonstration. Like nkoren said previous demonstrations have been extra careful to consistently keep it peaceful.

This time they wait until the protest has effectively finished trashing the legislature, then go in with tear gas and have a big sign stuck on riot shields of "WARNING: TEAR SMOKE". Both police and protest seem to be taking a dramatically different approach. The peaceful demonstrations that have continued appear separate.

Maybe it is as presented, but it sure makes me suspicious given history.