Well-stated, Bostonian. The reasons for such career choices are only "wrong" in my opinion when they are influenced by external/extrinsic factors such as "why would I want to be surrounded by all of these nasty people for the rest of my working life, again??" instead of "I have a desire to devote my life to helping others," which I consider an intrinsic drive.
My daughter is being buffeted by both things, however. When 95% of your classmates in CS coursework are fairly abrasive "dudes" that see nothing wrong with denigrating the "girls" for merely being there... well, that's a pretty hostile environment.
At MOOCs, where this should not be a problem, the usual patterns prevail, according to
http://chronicle.com/article/8-Things-You-Should-Know-About/146901/ . Females make up 46% of the social science and 40% of the humanities students in MOOCs, but only 9% of the engineering and 17% of the computer science students. Men and women have different intellectual interests.
