The trouble with these sorts of situations is that the police don't particularly care to go after the thirty or so nuts who are smashing stuff up; and instead continue to apply pressure on the peaceful protesters; who are themselves further riled up. Both the police officers and protesters become irrational, angry and prone to bad decisions.
It's incredibly difficult to successfully go after everyone who is smashing things up in these situations. I don't believe it is a matter of not particularly caring.
Oh yes, I was trying to imply that. It's human nature to avoid the dangerous, active elements of a riot and focus on the "potentially volatile" sectors. Just as it's human nature to react with terror at a bunch of police in full riot gear yelling at you and pushing you against each other.
The riot was
so predictable, especially with the prosecutor making such a big song and dance during his presentation. He must have known what he would provoke by his words. Blood. On. Hands