Is the Taliban a political party? They are a government, I guess? But a party? I dunno.

FWIW, the list of parties here seems predominantly focused on the US and Europe, with one party listed from Russia. I suspect that omissions from this list are not endorsements, but rather uncommon enough on the global stage to not warrant mentioning. The author doesn't go through and mention the Klan either, but like, the Klan isn't really openly active in the US government.

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Indeed. This reminds me of the story about Osama bin Laden's death vs. Margaret Thatcher's death from https://slatestarcodex.com/2014/09/30/i-can-tolerate-anythin... (discussed at https://news.ycombinator.com/item?id=37406719 and a few other times).