Hammer - your OP didn't say you couldn't work, it read very much like you don't work because you'd rather stay at home with your DC - a privilege lots of women wish they had, but don't because they have to work to put a roof over their children's heads.
WibblyBibble - I'm intrigued that you can make the assumption that not thinking tax money should support people who are capable of working means I approve of tax money being spent on wars or weddings. There are many things I don't like the government spending money on, but they're not what this thread is about.
It was mentioned somewhere on the thread that lots of working mothers use their parents for childcare, which is sometimes true, but many of us do pay for our own childcare as we have no parents around to help. Someone else said it's not fair that lone mums are expected to work just because they don't have a partner to support them to SAH, and that they have just as much right to SAH as women with a partner. I see the two points as much the same argument. Should I complain that it's not fair that I have to pay for childcare when other people have family to do it for free? Should I expect the state to pay for my childcare because I don't have parents to look after my children? Of course not. That's just how life is, we do the best we can with what we've got.
I also don't get the argument that raising a child is a job in itself and needs anyone's full time attention. Most people have children. Millions of people manage to raise children and work at the same time. It's not something that should award anyone a special position. I also think that staying at home is a luxury, not a right. It's a thing borne of Western privilege and a relatively new invention. Children have turned out just fine having been raised by relatives, collective village childcare and going to work with their parents for millennia. They really do not need undivided care an attention from a parent for their first few years.
I will add to the argument though, as was also mentioned earlier, that men are getting away far too lightly. Why does all the responsibility and stigma fall on the mother when a couple splits? The law should be far, far harder on fathers and they should be made to pay a sizeable amount of support for each and every child they father. It might make a lot of irresponsible men a lot more keen to learn how to put on a condom. I have no respect for any man who leaves his child and the mother of his child to struggle while he waltzes on with life.