Games, and in particular our culture of gamers, have a long way to come in terms of acceptance of women and other minorities. I think a prime example of this is the number of people on this thread who just don't care. They don't personally harass women, or they aren't women, or they've faced similar abuse and didn't care, so they don't understand how it's an issue.
What these people don't realise is, we have created an extraordinarily hostile culture with videogames. You don't go to bookclubs and have people yell, "OMG, you read Catcher in the Rye? ******!" or "LOL, women reading books, you should have spices in the kitchen, not books! LOLOLOL Where tits?"
There are various reasons for this, games being aimed at straight, white, cis, male, teens to early twenties university students, games taking place over the internet with all the protections anonymity provides, the competitive nature of games (this is one reason why sports have similar problems with hostile cultures) and probably some other things I can't think of.
This problem has increased to the point where the God damn BBC is reporting on it people! We are renowned for having an unfriendly and close-minded community at this point!
So why should we tackle it? Seems pretty simple to me, if we can create a friendlier, more accepting community then firstly it's more fun for everyone involved, secondly we can attract those minorities and oppressed groups that are pushed away from gaming and thirdly we will be seen as more mature and respected by our wider culture.
While I'd argue all those things are desirable in themselves, they also lead to more people entering gaming and more acceptance of gaming, expanding the medium and allowing it to grow and develop.
How we deal with this hostility is a tricky one. Clamping down on unacceptable behaviour is a good start. By making it clear that harassment is unacceptable we can influence our culture away from it. This can be accomplished by stricter rules, better systems for reporting assholes and clear disapproval from within communities.