And why did organizations that proclaimed family planning as a human right fail to oppose increasingly coercive policies in India and China? Why, instead, did they provide friendly advice and support, and defend them to all the world?
Actually, I think that Connelly's fine book goes a little easy on population control. He's only got one reference to Mein Kampf, even though Malthusianism was at the root of Hitler's machinations. As I wrote a while back:
Linking views you don't like with Hitler is of course the ultimate political cheap shot. But as an economist, I don't mind buying cheap, especially if the quality is good. When someone says "There are too many Jews," we suspect that he wants to kill Jews. Similarly, it turns out that at the root of Hitler's propensity to kill people was his belief that there are too many people.
And if you're tempted to say that Hitler proposed a barbaric solution for a real problem, take a look at how Germany actually did feed its population since 1945: increasing agricultural productivity and increasing exports. The two methods that Hitler dismissed out of hand transformed Germany into one of the richest nations in history.