My friend got mugged ...

... outside our halls this night. The security guards from the opposite building where watching happily while having a fag. The robber was peculiar himself, as he demanded to give my friend her SIM card back, after he stole a mere 20 quid and one of her mobiles. I live in NW1 of London, that's supposed to be a safe area. Why was there no security guard at our reception, as he should be?