I know that I for one didn't say that the London bombers were immigrants. I just said there should be tighter controls on immigration, as terrorists can get in that way. Admittedly it doesn't deal with the problem of home grown terrorists, but it's still a potential threat that urgently needs to be dealt with.

As for blaming outsiders for everything, that has been going on for centuries. Like right after the Great Fire of London in the 1600's the French and the Dutch were blamed. It's human nature and it's not going to change any time soon. It's a way for people to cope with disasters.