Good points...I would advice seeing the DVD “Demographic Bomb”. It covers a few of these points as well as a few others.
As a father of a single income, family of nine (wife, seven children, and myself) I would agree that our culture over all does not accept larger families...but it is neat to see the reactions of people in the stores. If we go to the larger cities we will normally get some nasty stares but in the more rural areas we will normally have some older couple that will come up and tell us how glad they are to see a large family again.
It gives us the opportunity to show our children what a real "counter-culture" looks like. One of the key points we like to make (in public, if possible ;-) is that many of our culture's "imperatives" are actually conscious choices about values and priorities. When most people say, "I couldn't have more children," they really mean, "I made the choice to value something else more."
I sometimes think that recognizing yourself as a person who is deciding priorities and making choices, rather than as a person who is the Victim of Mysterious Forces, is THE KEY to being a contributing person rather than a drone.