Firstly, they are radicals therefore they don't represent your average Muslim out there on the street. Secondly, not all protestors were peaceful in London, certainly weren't at the G20 protests and I should know coz I was there
Thirdly, they do have a point. The war in Iraq was unjustfied and solely for the purpose of getting greedy people oil.
Double standard it may be but this country prides itself on freedom of speech, their religion doesn't.
All that being said, I am in no way defending terrorists. I just don't like people hating on all Muslims as a collective whole for the actions done by their extremeist counterparts.