Given that we have a millennia-long history of gender discrimination and given that women got the vote less than a century ago, this "just" is ridiculous.
Look at this graph:
http://www.npr.org/blogs/money/2014/10/21/357629765/when-wom...
I guess in 1970 women "just" didn't like medicine or law. (That's certainly what people said then.) And now, using your helpful explanatory framework, they "just" do! It's unexplainable! Things just happen without relation to other things. Who could possibly know anything?