alt Hacker NewsGamerGate wasn’t doing that work and they distracted mightily from it. For example, the much-hated Kotaku was actually doing reporting which got them black listed so not only was GamerGate not contributing there, they were actually harming the people who were:
https://kotaku.com/a-price-of-games-journalism-1743526293
Even if they had also been involved, it would not excuse the abusive behavior.
That Kotaku piece was a full year after GamerGate, if anything people might question whether it'd have happened if GamerGate hasn't drawn attention to these problems.