Yes, it's important to attack the root cause. Might it be that the hyper-male workplace contributes to the perception of technology as a place hostile to women, and by attempting to counter that particular problem (e.g., by having diversity initiatives) it also helps attack the root cause?

I do think "diversity initiatives" are like voting in that it's the least amount of effort to put to the issue. I agree with your comment in this sense: I'd like very much for companies to go much further to address the root issues.