Two quotes from Antoine de St-Exupery:
A civilization is built on what is required of men, not on that which is provided for them
If you would have them be brothers, have them build a tower. But if you would have them hate each other, throw them corn
Most liberals would probably argue that the British rioters did what they did because not enough had been done for them. Conservatives, on the other hand, would tend to say that it was because not enough had been expected of them.