I wasn't here for the last topic so I'll just post in this one.
The reason has nothing to do with any perceived weakness in gender. It's sole purpose is to encourage more women to play chess.
As it stands now, Chess is perceived to be a Male dominated endeavor. That perception alone is enough to keep it as such. People are less likely to take up any endeavor they feel is socially unacceptable for their station. Providing a Women's league states unequivically "Hey, this isn't just a guy thing". It provides women a socially supportive entry into the chess world. Thereby encouraging more women to take it up.. Something nearly everyone agree's is good for Chess.
Someone might just as well create a Men's league, but what would be the point?
Since I started playing chess (I was 10) I appreciated its "universality" and the fact that whatever is the physical appearence or force of the player you only need to look at the board and understand the reasoning behind the move. Players with heavy physical handycaps can enjoy playing and (why not) beating other players without being addressed to a kind of "para"chess. This is why I do not understand a women chess championship and I find it as pointing out a kind of intrinsical weakness of female gender, which (at least in chess) is not there. I would appreciate any comment on this. By the way Imappreciate a lot Judit Polgar for having always plaied in "normal" chess tounnaments.