Oh dear, the usual strategy of argumentum ad nauseum...
There is no class consciousness in the rioting. There is a trashing of local communities including the robbing of local people's houses. The nearest we have to any example of class consciousness is a group of teen girls telling the BBC its all about recession and kill the rich and people 'not respecting them'. That is not class consciousness, those are just slogans for the media after the event. What we have is organised criminality against - and organised crime is the classic organisation of the lumpenproletariat. So the term stands.
Your criticism zero tolerance is just the standard libertarian position on this, i.e. zero tolerance caught a wave of lowering crime rates in the US. Whilst that is true, it is not the whole picture and the experience in Hartlepool and Strathclyde in the UK confirms that of New York - that policing targeted at specific crimes in a community works. Yes, it may not be the whole story but was shown to be a significant factor. Again, I would prefer this to your undefined 'grass roots' nonsense that has been tried in London again and again in places like Lewisham and Lambeth and has just point blank failed.
There is an underlying social context - but it is not poverty or social alienation, it the massive growth of city populations, the fracturing of communities by uncontrolled immigration and the collapse of tradition measures of social discipline.