First of all that is looking at British Muslims who are a tiny minority of the 1.6-2 billion Muslims in the world.
Maybe take a look at the number of muslim civilians killed in Somalia, Iraq, Syria, Pakistan, Bangladesh by the number of Muslim extremists. It's a lot more than you seem to think.
British Muslims would seem to be one of the least radical Muslims. After all, they don't kill gays like Muslims in Iran, Afghanistan, Yemen etc.
I never claimed that radical Muslims don't want to kill other Muslims. In fact the Sunni and Shiite conflict probably killed more Muslims than non-Muslims.
Maybe take a look at the number of muslim civilians killed in Somalia, Iraq, Syria, Pakistan, Bangladesh by the number of Muslim extremists. It's a lot more than you seem to think.