>The problem is gender roles. Men are taught by society to think that, as men, they should go into certain careers. These careers, like software development, tend to be higher paid than the careers women are encouraged to go into.

Kinda works both ways as an argument. If they were so concerned about pay, they can try and negotiate for more. Men are taught/encouraged to do this more from a young age. If you want to be paid more, you gotta haggle, you can't just accept the price on the sticker.