If you were holding a party and you had gatecrashers show up at your place or had guests who you thought would behave themselves but weren't - would you have them thrown out? Of course you would.
Yet when it comes to your country, those who have had enough of the way Muslim invaders and migrants behave and say so publicly get lectured to about being 'racist'. And people have just had enough of it.
Not Oslo as stated, but still representative of young, fit and idle Muslim male migrant behaviour.