Why is gamergate (which is a horrible name, BTW. Not everything has to be paralleled to the GOP's break-in to a Democratic headquarters that happened in the 19 fucking seventies for fuck's sake) the big focus of all that is wrong with threats and misogyny on the Internet?
This is a more general problem with more general roots than anything to do with the principle actors in this situation. You blame the people attacking this particular journalist at this particular time for picking their target specifically when there's in general a bigger problem in gaming journalism. I'm simply saying that beyond this one case of targeting specific people, there are other cases of "doxxing" (another loathesome word, by the way), threats, and general misanthrophy/misogyny/misandry all over the Internet.
Getting these 4chan dwellers and other trash to leave these specific women alone is a victory, but it's a small and isolated one. Convincing a generation of maladjusted young men (and yes, it is mostly boys and young men although they target both men and women) of the terrible distastefulness and inappropriateness of their words and actions should be the long-term goal.