If it proves to be an isolated incident then its possible to label the rioters as a bunch of morons. It may be justified to dismiss the neighbouring Enfield rioters as cashers-in to the same violence. Bear in mind that there were student riots a few months back, and you can see the begining of a trend.
The 1980s had more or less continious riots and serious clashes between unions and police forces. The current spats are not at that level yet, but you can see that there is the potential for these problems to become more pronounced.
Cutting Police numbers and the ridiculous bureacracy that Police departments have to engage in do not help these matters, but I doubt that much can be done about this in the short to medium term.
The UK is not unique in suffering riots like this. These kind of riots are pretty commonplace in French cities and break out almost every year now. If you look at Greece, where there is very heavy austerity and social reaction by way of riots; it is not difficult to see what can come here - if our Government does not deal with the circumstances of these and other riots i.e. its not just a Policeing matter.
The Police do their job to the best of their ability, but if their citizens dont work, take drugs, deal in criminality etc - along with Police department budget cuts; then its not difficult to see the outcome.