May I go one further than Don and Richard and point out that it was the USA's cultural and economic imperialism - of which those in the two towers were in fact the troops - that created the situation in which those without arms who wished to defend their cultures had to turn to violence?

Like the hypocrisy that attacks Ken Livingstone, I am tired of the hypocrisy that funds terrorists who attack the UK, but screams "foul" when its own forces of oppression get their comeuppance.