for the OP's question, I reckon it is because, quite rightly, there would be far too much anger as many here would feel very very judged. there are many women here who are on benefits, and they would feel slated and demorilised for their choices over how many children they have.
however
it does make me cross when I hear of the ((thankfully very few)) families who have baby after baby, all the time on benefits and not making any effort to support their family in any way.
I personally know of one family who have just had their 13th baby, neither work as they both claim they are disabled and yet I see absolutely no sign of said disability (dad says he has a back problem yet goes out on his bike and gardens and does cars etc, mum says she suffers permentant PND!). they have spoken of their desire for a bigger house, and personally said to me once that they will have more babies until the council gives them said bigger house.
now, that makes me mad, but then, is it the family;s fault for having no bigger ambition in life than the one they live, or the government for allowing such families to occur???
this is the extreme I know........99% of people on benefits are on them to allow them to still have a fairly decent standard of living while still working, as we all know that many wages are under the decent amount that we all require simply to exhist...and it is our right also to be able to have a family, but sometimes, people do take the piss, and it is so unfair as it then rubs off badly on those who are not....IYGWIM.
BUT
it is not for any of us really to judge others, until we live their lives........