I agree it’s often used to shut down discussion, but most often I’ve seen it when a contributor is losing an argument (their PR isn’t getting merged, or their feature request is rejected, or their bug is marked wont-fix) and they don’t agree.
“Victim blaming” is an odd phrase here. Could you clarify what you mean?
Sure.
As background, when power is misused, you'll often find somebody immediately showing up to explain why it was the fault of the person harmed. In the US, for example, this happens basically any time a cop kills somebody. In analyzing the situation, the agency of the person with power is minimized or ignored; the agency of the person harmed is maximized.
Open-source project are often run as little fiefdoms. Power is concentrated; checks and balances are minimal or nonexistent. Note that I'm not saying that this is bad or good; that's just how it is.
The "just fork it" style of response that the article is addressing, which I don't ever think I've seen in an issue but often see here on HN as a response to some complaint about a project. It's not part of a careful analysis about the costs and benefits of forking. There's also little or no attempt to understand who a project's audience and community is, or the value of the complaint in that context. It's a drive-by response to shut-down a complaint in a way that treats the complain as illegitimate, suggesting that person is wrong for wanting something different from what's on offer.
Does that help?