Smedly is on to something...as shocking and unexpected as it sounds, there are indeed bona-fide feminists in the midst of Traditional Catholic enclaves and chapels everywhere.
The World is all around us, and we shouldn't be too shocked if it picks off a few "victims" who fell for the siren song of its influence.
The World is crazy, but some people actually fall for the craziness. Heck, there are Trads who believe the official government propaganda/story of 9/11 for crying out loud! Trads aren't always the brightest bulb in the box.
Another point -- there's failing with one (or two) black sheep, and then there's failing with a majority or even 100% of your children. One or two children can just be black sheep/rebels, going against everything the parents taught or stood for. But if MOST or ALL children in a family give up the faith, become feminists, etc. then THE PARENTS WERE DOING SOMETHING WRONG. They sent them to public school, set a bad example, taught a bad example, allowed worldly influences in the home (TV, Internet, cell phones, bad company, etc.), failed to educate properly, failed to discipline properly, and/or other derelictions of duty.