Riots in Harlesden

The rioting in Harlesden was thankfully fairly limited.  I went round with the police talking to shopkeepers on Monday, and only two shops were attacked _ the pawnbrokers by The Shawl and the pound shop opposite HSBC.  I understand the greed motive in attacking the pawnbrokers, but why the pound shop?  I assume that part of the rioting was organised crime, and part opportunist, almost curiosity driven, theft by people who wouldn't normally be involved.