Which proves my point.....interpretation is needed via thasfeer; merely reading the Qur'an and hadith are not sufficient. And it's mere mortal man that does the interpretation.
There is no true islam or muslims, as there are no true christianity or christians (or any other religion). There are as many different islams as there are muslims. Which gets me back to the topic; the perpetrators in London were acting in their reading of islam....it may not be yours or many other peoples, but it was theirs. So when they said they were acting in the name of islam they meant it and can justify it in their own twisted way.