It's not skin off the back of any one rioting though, I doubt very much any of them pay tax. Things like this make it very difficult to keep a left wing stance, personally.
I don't see why. A disintegrating (un)civil society is, in my mind anyway, evidence of how years of right wing policies have done nothing but create alienation and a culture of thuggery.
It is clear these people, whether they pay taxes or not, feel they have no stake in their communities, their neighbourhoods, or in society as a whole. And you can't hardly blame them for not paying taxes when years of "free trade" highway robbery has sent their jobs elsewhere.
It is ridiculous to think that cuts to programs that enhance social mobility (such as subsidized uni) combined with nothing but the crappiest jobs available for anyone not born of means wouldn't result in this kind of insanity. Also, I am not sure about your school system but if it is like any other school system in the english world over the last decade and a half of uber conservatism, it has been constantly under attack, underfunded, and lacking any innovation or changes to meet 21st century realities.
The MP for Tottingham predicted this kind of event when the cuts came down. And he was right.
What do you expect happens when you offer a significant portion of your society no means of living but working at Tesco for the rest of their lives, or Micky Ds or Subway (or whatever) - of course they are likely to become disenfranchised and prone to angry outbursts.
I am not excusing the incredibly poor behavior being shown here, but I don't think that abandoing principles which support lowering inequality and investing in those members of society who need it the most is a solution - it is growing inequality which is the root of the problem!
Obviously just tossing money at this problem won't solve it either. The roots go deeper. I am not sure about the comprehensive solution, but I do think the first step is fighting for more social mobility by fighting for better public education and MORE not less access to university.