I think it's because there is a fear that the dudes will go all teary eyed if something happens to a chick they care about, this will make them do stupid stuff. It's about the nature of a quality man which desires to protect women, whether it's God given nature or evolved behavior, a good man wants to protect women the same way a good woman wants to protect children. This will take a while for the older generation to get used to. I fear we've caused most of the next generation of men to act like women and blurred the gender lines so much that it won't matter much for future generations anyway.