Tons of such threads were flagged. Most were both heavily upvoted and heavily flagged, in some cases upvotes won out, in some cases flags won out, and in a few cases flags won out but moderators overrode the flags. This is the normal tug-of-war with divisive submissions on HN—where "divisive" has multiple values: people are divided politically, but also about what's on topic for the site.

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