I agree that there was no actual SWATing in Cernovich's case. He has been reported to the LAPD (probably several times) for harassment. However he has been doxxed, and I don't know how you're saying none of it was done by Quinn. Quinn has 52K followers on twitter. I think I can conclude that her tweets are widely read. And she has repeatedly publicized dox articles. Does that make her any less guilty than actually writing those articles herself? And Quinn herself admits that doxxing and SWATing are a package deal. SWATings are usually initiated as an anonymous tip, "stranger's actions", as you put it in a different context. I don't know how the law works in the US, but if it were up to me, I'd hold the doxxer responsible for it.
The Guardian article is probably right in naming baphomet (on 8chan), but then follows it up with some very shady language to link it with KiA. I have visited baphomet a few times, and they seem to be doing their own thing, whatever that may be.
As far as I know, Reddit has very strict policies in place to discourage doxxing (except on r/doxme). KotakuInAction, the one you called gamergate's organizing site, cannot be involved in doxxing. Though I'm not a regular reader, I visit it every few weeks to see what they're up to. Not only have I not seen any doxxing there, I have seen threads discouraging such behavior. Also see their Rule #2: "This is the quickest way to a ban, not just from us, but the Reddit admins. Seriously, don’t do it. Take every effort to ensure that your posts do not include any personal information, especially in screenshots."