Another Failure in Britain's Magical Gun Ban Barrier

I think the government over in Oceania better hire more magical wizards to strengthen the gun ban barrier because there was another impossible failure...

http://news.bbc.co.uk/2/hi/uk_news/england/london/8153183.stm

From the article...

A 21-year-old man was shot in the head, face and chest by a masked gunman in a south London kebab shop.

I still don't know how this could happen. Didn't the criminal hear that guns are illegal? I mean you can't break a law to commit a crime that's illegal. This article makes it seem as though gun bans don't actually stop gun violence.