@wayne,
I think that there's not just one 'root problem'.
Secondly, the situation (in various but important aspects) is different in the UK than in other countries. And in London, and here in Tottenham especially. (For instance, London is Britain’s most unequal region by far, in terms of the income gap. And Tottenham has one of the highest unemplayment figures for youth. According to the definitive report from the New Policy Institute, 19% of the population of Inner London are in the top tenth for income nationwide while 16% are in the bottom tenth. In inner London 20% of people have 60% of the total income. )
It's easy to call for jobs - there aren't any.
What you can do, however, is giving this youth a new, different perspective; teach them to make the best out of their current situation.
That's however totally impossible with current cut's by the Conservative/Liberal government (London as well as UK):
London’s local authorities have borne much of the brunt of the Government’s austerity package – their grants from Whitehall fell by 11.3% this year and will drop a further 7.6% in 2012/13.
And the first non-essential services to be cut include youth services budgets.