PeanutButterMum - it's the same at a lower level as well. I know when mine were very young that by the time you added up my salary, CB and childcare element, and then deducted my overall childcare costs and bills (all of which were bare minimum), I was worse off than my single parent friend on benefits despite the fact I worked full time.
The difference was, of course, that I had the opportunity to lift myself out of poverty if i continued working. A hopeful future. My friend, who had no qualifications to speak of, had none, save a future of life on NMW once her child started school.
Despite being poorer than her in those days, I know which position I'd rather be in. And, of course, these days my life is enormously improved, so my gamble paid off.
handcream - I don't think we should excuse people's bad behaviour either, but if you really want to change things (as opposed to appeal to the mass's sense of justice), you have to offer people the means to change their lives before you penalise them for not doing so. This at a time when resources for education (in real terms, not this ring-fenced rubbish), children's services, sure start, refuges, community outreach projects, CSA, etc are all being cut.