I have a deep and abiding problem with the mentality that depriving people of whatever is the only way to make decent/happy/unselfish/insert-your-own-adjective-here adults. That can't possibly be true.
When parents are genuinely committed to facilitating their children's pursuit of the things that make them (the children) happy, I think those children are more likely to grow up with a desire to help others. They know they're loved, and their needs are not forgotten, and this frees them to care about someone else's needs.
When parents express the attitude that, "There are only so many pieces of pie and these crumbs are what you get," children are more likely to learn to grab what they can when they can.
But I in no way believe that being born into a big family means you get "crumbs," any more than being born into a small family does. It's all about the mindset of the parents.
If you see love and good things as pieces of a pie that, "Now you see it, now you don't" (there's only so much to go around and when it's gone, it's gone) -- well, one child is probably too many for you.
But if you believe the old saying that, "The gift of life just keeps on giving," you can have any number of children and no one's going to get stuck with "crumbs."
I only have 2 children. I'm 43 and maybe there'll be another -- but I can't count on that, so I'm certainly not knocking people with 1 or 2 kids. We're a small family and very happy. You can have a full, rich life with 1 child and you can have a full, rich life with many children.
I think the people who are truly happy with their choices, don't feel a need to knock the choices of others. If I'm happy living a simple, non-materialistic life with little in the way of extras or possessions, I certainly won't feel a need to label someone else's lifestyle choices and prized possessions as "junk."
And if I'm happy having fewer children and being able to spend more money on each individual child -- well, you get the picture, I sure won't be pointing the finger and saying, "That other couple has more kids than they can afford."
So lets all just be happy and give each other the same respect we'd like to have ourselves!