Aehm, you did it to yourself?
What probably can be generalized is that only a minority refuses clearly unethical (some may say evil) orders from authority, as long as there is at least some, with Milgram not very large, force behind these orders.
Probably one of the reasons totalitarianism raises its ugly head time and again (and it is well on its way in the west this time): There are just too many participants that can be recruited with minimal effort and they tend to pile up. Humans are mostly still cavemen.
Your fact happens to be bunk because it ignores necessary details. Sure, Biology, Sociology, Gender Studies, Architecture and such often have more women, but that does not make a real-world "50% in the sciences". For example in architecture, I just recently talked to a PhD Construction Engineer (female, and not bad looking either) and she said that her reason to switch over from Architecture after a few weeks were all the very "special" women in there. (She did not say "stupid", but it was strongly implied.) What you find when you actually look is that the "50% women in sciences" (where they exist) are in soft subjects or subjects where a soft path exists and mostly/completely nonscientific subjects (gender studies, education "sciences", etc.) and really, that does not count. Show me some country where female EEs, computer scientists, Physicists, Mathematicians, etc. make 50% of the students, and we can talk again. (Yes, I know some women in all of these disciplines, several of them with PhDs. They do exist. But they are a minority and will remain so.)
Same here. These "studies" often are not much more than the condensed prejudices of their authors. The better ones at least usually only tricked themselves by faulty methodology.
Seriously, you do not think women have free will and think manipulating them into something they do not want to do just to fix a statistic is acceptable?
Or garbage-disposal persons and sewer-cleaners. It is high time this blatantly sexist imbalance gets addressed.
Oh, yes. Just replace Patriarchy with Matriarchy. That will solve all problems. Not. It will be a bit different, but it will be evil fuckery just the same.
Far more men than women are interested in joining the sciences as a career.
So really, Science is predominantly male and that is by choice of the women. The good thing is that any woman that wants to be a scientist and has the talents and skills can be one in the western world. The reality is that most do not want to. Deal with it.