I don't know, and I don't know if the stats even exist to prove this, but I reckon that for every 25-year-old-mum-of-7-by-7-different-dads there will be a kid from a high-rise estate who's managed to become a regimental sergeant-major, say, or got to uni to read medicine, or owns a string of car dealerships, or is Mo Farah (Somali immigrant). The net economic effect will at worst be neutral because we did not leave them to rot.
It can't be easy or nice trying to live on benefits. Your enormous telly and games consoles give you a) a bit of escapism (but with constant reminders of stuff you can't afford and places you'll never see) and b) a chance to know the kids are in and safe, instead of letting them take their chances on the street corner or in the stairwell. It must be horrible getting to the checkout in Lidl and having to put back 'non-essentials', like jam or squash. If it seems that there's an attitude problem among the non-working class, it could be that this bravado is a Rizla-thin veneer that keeps them from breakdown. In short, I don't believe it's anybody's real, look-themselves-in-the-mirror choice to live on benefits.
I'm not a pinko Trot: I strongly believe that work ethic, shrewd financial sense and the profit motive are the bedrock of the economy and that most people on here are truly blessed to have these attributes - the choices that gives us and our children make us society's winners. I also strongly believe that the economy isn't a zero-sum game: to have winners, there don't have to be losers (see, this is where Marx was wrong), in fact, everyone wins. One manifestation of this is that we all get more, better stuff, cheaper - warm homes, mobile phones, huge tellies, kidney dialysis machines - thanks to all the people, from whatever background, who make the economy work in its mysterious way through their supplies and demands.
So it's not just civilised, it's probably pretty sound sense, not to cut adrift people who can't, at this time, manage for themselves. Neanderthal remains have shown that even those proto-human societies looked after their disabled fellows and while I realise that hanging my argument on the peg of the actions of a species we drove to extinction is a little shoogly, I think the Welfare State is up there with the Falklands War and Bitter as things Britain got right.