I make it a rule not to get involved too deeply in political debate (I have a short fuse), but wanted to correct you on one single point:
I believe the 'nuclear' family of 2 parents, and 2.4 children (or whatever the often quoted number is) is a myth. For every family that is childless, or has only a single offspring, there are several more with 3 or more children.
The problem we have is simple, and has been quoted here already - 90% of the people want to live in 10% of the space. Whether that space is the coastal region of a continent like North America, Australia or Africa, a group of islands like the British Isles or the Phillipines, or an urban conurbation, or whatever - the same holds. There's not enough (desirable) space for the people that want it, *regardless of where they originate*.