It's both. Saying "the problem" is the parents, implying there's one problem and that's it, is ridiculous. There's a lot of factors that go into why raising a good, caring, strong, self sufficient child is difficult.

We see this same type of argument from the "pull yourself up by your own bootstraps; if you weren't lazy you'd succeed" crowd. It's a stupid argument there, and it's just as stupid here. The world is complicated, and working to improve things from multiple angles is good, and improves the changes of success; for everyone.