The Chinese apply the law equally to all families.
Yes, perhaps forcing people to do it is too far, perhaps voluntary steralisation with tax incentives.
Nothing works better than opportunity. Europes negative population growth has a lot to do with economics. It also allows new cultures to come in and mix into a static culture, since the popultions will continue to grow globally, this means we can all look forward to new cultures mixing with ours. (Just as it has always been). (Europe's population isn't "at risk" in any human sense, it will be replenished, just not by the preferred races and creeds of some bigots).
However, you're right, overpopulation is a severe problem. Perhaps its time for a Global Flood, eh? That would make more than few people on this Forum giddy with glee!
Seriously, though, you have to give China credit for making a tough decision. As much as it caused female infantcide, it kept their population lower than it would have been. Of course, now the sheer numbers are becoming impossible to manage.
I don't think there are policies that can fix the problem (in terms of pop. control), war, disease and famine will be much more effective, as sad as that is. We in the upper classes and richer nations have little to fear. We will always take the resources fo the poorer and defensless.
However, we will fill tomes on how we have moral responsibility for this and that, and we should do this and that, etc....