I imagine that western imperialism is the cause for a lot of Islamist terrorist attacks. But the fact remains, when western people go to a concert, they take note of where the exits are. That fear was created by radical Islam. Islamists still committed the terrorist attacks and that's inexcusable. Other Muslims need to condemn things like this strongly to maintain their image. The people slaughtered in terrorist attacks like this are absolutely innocent and had nothing to do with the wars in the middle east.
As far as a Brit like me is concerned, the grooming gangs were and are Muslims. We don't know of the specifics of what kind of Muslim they are. They are Muslims that we invited into our country, and they thanked us by raping underage British women.
Can you imagine how that might stir up anger? Is it unreasonable for British people to be angry about that? No.
Also, when did Canada attack an Islamic country? When did The Republic Of Ireland?