A safety net isn't a net you just jump into
I am saying that there is a difference between helping people whose circumstances change, and protecting people from the consequences of their choices. We should not be encouraging people who cannot afford families to have one by compensating them for their choice, certainly not when they keep repeating the poor choice.
If we want people to have large families, then we should encourage all people to have large families, not just those already heavily dependent on the taxpayer. I can't go to the bank for a larger mortgage just because we have another child, and yet that is the ludicrous situation available to those on benefits.