My personal view is that the belief in biological determinism is too widespread. Up until the mid-1800s, nurses were often men. Nightingale's views played a big role in making nursing a female dominated field, partially justified by saying that women are naturally nurturers. It's all too easy for people to argue that sex-based, race-based, etc. roles have a biological basis, when it's actually cultural determinism. And we know this because things have changed in timescales that aren't possible under a genetic basis. But it's easier to assume things are because they are than it is to change one self and the views of others.

In any case, I think this thread is nearing the end. I thank you for your participation and consideration.

And my thanks to everyone who chimed in. I found it an insightful discussion. A great example of the reason to keep reading the comments on Hacker News.