Look at the motives: France was really pissed-off about not getting the olympics...
You know what the sad thing is? You mean that as a joke and it would be very funny but for the fact that there are, predictably, some Muslims who are actually seriously saying that.
Case in point:
"Maybe the French did it because they didn't get the [2012] Olympics and England did," said Aftab Ahmad, 27, a waiter who attended the Central Mosque [London] prayer service. "Why do they always say Muslims do attacks like this?"