plus anyone can convert to Islam you don't have to import them. I think everyone should have better immergration policies but I don't think these attacks happened because of Muslims.
These attacks were done by the UK's own government. See this http://www.rys2sense.com/anti-neocons/viewtopic.php?t=220
The reasons for terrorism is not an irrational hatred of the west. The motivations are very real. The US and the UK historically and currently has been killing people in the Middle East with sanctions guns and bomb in order to steal their resources for hundreds of years. The US helped to set up dictatorships in places like Iran because dictatorships are reliable and good for stability and investment. You only have to bribe one guy.
For example in 1953 the CIA restored to power the shaw of Iran in exchange for 50 percent of Irans oil assets and hundreds of miilions worth of US military bases to be built in Iran.
The US supports the brutal and illegal occupation of Palestine for the last 36 years. The US attacked Lebanon in 1982 with Israel over nothing. We have bombed Lybia, Iraq, Afghanistan, and Egypt as well.
You don't have to be a Muslim to hate people who bulldozed down or blew up your house and killed your kids either by starvation of shooting them while they were at school.