I suspect this thread has moved on somewhat, but the OP is somewhat off the mark, largely because they've conflated several issues together as one big issue.
Poverty does lead to underachievement and bad behavior; as a youth worker and mentor I've seen this time and again. It's largely due to boredom and opportunity - poor families simply can't afford to get their children the excursions, holidays, books, toys and distractions that TV tells children they are entitled to expect. These children get bored and disappointed, seeing this lack of material reward as some kind of reflection their character. At a very basic level - Santa doesn't give bad kids presents. I didn't get any presents (or, at least, I didn't get the presents I wanted or that Timothy whose Dad works for Lloyds got) therefore I must be bad, therefore I'll behave badly.
Oh there are some bad parents around, for sure, but it's often because their parents were bad, and theirs before them, and so on, ad infinitum. The cycle needs to be broken somehow.
The genuine poor in the UK (and they do exist) are failed by the school system - you only have to look at the stats for University entry to see this is the case.
I agree with the OP that attitudes need to change, though in this case I would say that the attitudes which need to change are the OPs - if people accepted that there was a problem and there was poverty we could crack it. Instead of saying "it's all the parents fault; how dare they not be born rich" we could actually pay more taxes for a welfare state that actually works, as in Sweden (where there was massive urban and rural poverty pre-WWII, entirely eradicated by progressive taxation and welfare polices).
So, yes, YABU