I'm as pro-choice as can be and I also think the world is overpopulated. There is no contradition at all. I do think people should be free to have as many children as they want, but that doesn't mean I think people like the OP describes are making good decisions.
I agree. One can think people should have the right to make their own decisions, and at the same time wish they would make good decisions.
As for this family in particular, I think if you deliberately enter a situation where you know you'll need help, and then you ask for help, you are giving the people you ask the right to say something about that decision. You can only say "it's my decision and I'll live with the consequences" if you are truly willing and able to deal with the consequences, and won't ask others to deal with them for you.