There are no more jobs for low income people, that's why they are angry.
Britain has effectively exported all those jobs to lower wages countries. Under the burden of CO2 and other regulations, all of these jobs have fled the country. Take a look at Spain, the same thing is happening there. These stimulus jobs are taking down regular jobs at a factor of 2,2. That industry is not coming back.
We, EU and Britain, have effectively destroyed the base of the pyramid. That's why we have a financial crisis and that's why these youths are revolting. It has not yet hit the upper steps of the pyramid, but it's bound to collapse.
Maybe then, we will stop with all this folly and turn back to normal.
I hope things in Britain work out and that this doesn't set off in other countries.