"I asked him why he had a beard but no moustache. He said he's "too lazy to shave his beard and his moustache gets in the way." It was that simple."
For the bus driver, yes. For someone who blew themselves up with TATP outside a crowded stadium, who had attempted to purchase ammonium nitrate two days prior, who had other explosives in his apartment that he shared with a Pakistani, it's not that simple.