Some have already decided that the REASON for gender imbalance in tech is rampant bias and male privilege, which they have publicly committed themselves to stamping out. Whether or not this is true, questioning the validity of that reason is considered an attack on their identity and value system.

Edit: I'm not sure it's clear from my comment, but to clarify, I am NOT SURE what the reason for the observed gender imbalance is. I'm not saying that it isn't bias/privilege/etc. I don't think the case has been proven one way or the other, but the personal attacks & utter misrepresentations I've seen used to try to shut down discussion is driving me pretty hard emotionally to one side at the moment.