"and not sincere attempts to make a philosophical point" - So, he's confused atheists and moral error theorists, but the point is rather valid philosophically. It is very easy to say that one doesn't believe in morality in the abstract, but much harder when confronted with a vivid, specific example.
"Sincere" and "valid" aren't the same thing.
Link to Blog Post: "Extremism in Thought Experiments is No Vice"
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