Start shooting. These are looters and anarchists. No arrest warrants, no counseling, nothing. Put a bullet in them and when their parents come to collect the bodies, charge them for the bullets.
Nah, too much like Red China. Instead, when their parents come to collect the bodies, let them know that the government supplied - free of charge - a lead medical treatment for relief of anger and to calm them down. All courtesy of Swedish socialized medicine.
Swedes do that and they better be prepared to put a bullet in the cops and military that come to arrest or kill them for protecting themselves. Their statists overlords will not tolerate the people doing what is right.