Gamergate isn't at all upset about "diversity". Quite the contrary - there are prominent gamergaters who hail from visible minority groups.
What they're really upset about is two different things: a) a lack of integrity in the gaming press (insufficient disclosure of conflicts of interest, collusion, etc.) b) a hard-line form of liberal-left politics that has become thoroughly entrenched in the press business that isn't necessarily in alignment with the readers, a situation to the press declaring video games (and the people who play them) are a deleterious force on culture. All sorts of nuanced argumentation can be made here, but to say the least the press used inflammatory language (sexist, racist, harassers, reactionary, and so on) that quickly shaped outside public opinion of the people making the arguments, leaving them unanswered. Sure, like always happens in controversies like this the thoughtless assholes emerged from the woodwork to send nasty, threatening messages to people, but it's happened to *everyone* involved, on both sides.
Moral of the story: Friends don't let friends read Gawker. They were the epicenter of a lot of this mess.