We've written about the gender gap in publishing fairly extensively before and I feel we more or less said what we had to say on the subject, but here is an anecdote that I think about when the conversation gets heated:
There was a period of a month or so where we only solicited women, and were very active in doing so. We made a point of it. We wanted to be part of the solution. We wrote them individually, praising their work and letting them know how we found them so that they could easily submit similar writing. Of those women we solicited, several said they would or might submit. None of them actually did so. While several women have responded to our general solicitations, none have responded favorably to individual solicitation.
You can blame that on the nonexistent reputation of our largely theoretical magazine, but I've heard similar things from many other editors with more established outlets. As such our publishing will not be as balanced as we would like, and we've had to make our peace with that. Editors are responsible for the doors they leave open and the methods by which they curate, but writers need also to take responsibility for their own careers.