Riots in Denmark by Muslim "Youths" - Authorities stumped as to why

Outraged Muslim "Youths" torched cars, burned an elementary school, and attacked at least one journalist in the 5th night of rioting in Denmark:

Seventeen people were arrested, Copenhagen Police spokesman Flemming Steen Munch said, adding police were not sure what sparked the violence.

Some observers said immigrant youths were protesting against perceived police harassment and suggested the reprinting of a cartoon of the Prophet Muhammad in Danish newspapers Wednesday, may have aggravated the situation.

"They feel provocations and discrimination by the police that stop then now and then to check them," Copenhagen social worker Khalid Al-Subeihi said. "It doesn't make it easier when the cartoons come back again."
The "cartoons" being referred to are the famous drawings of Mohammed that originally appeared in the Danish publication Jyllands-Posten portraying the Muslim prophet in an unflattering light. Danish newspapers have recently re-published the cartoons to show solidarity with the man who drew them after it was revealed that Danish police foiled a plot to murder him.

But according to Police and social workers (who will not mention the fact the the rioters are Muslims) they don't know why the violence erupted:
We don't know why they're rioting. I think it's because they're bored. Some people say it's because of the cartoons but that's not my opinion," [Police Chief] Olesen said.
Talk about burying your head in the sand to avoid the truth...
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