A fallacy where someone dismisses all arguments of a person by labeling them "radical," "extremist," or "fringe." The label functions as a dismissal: if you're radical, nothing you say needs engagement. The fallacy lies in treating the label as refutation—as if calling someone radical proves their arguments wrong. But radical doesn't mean false; it means outside the mainstream. The mainstream can be wrong; radicals can be right. The fallacy is particularly insidious because it uses social position as epistemic judgment—confusing marginality with falsity.
"I presented a critique of economic inequality. Response: 'That's just radical leftist nonsense.' That's Radicalis Es Fallacy—dismissing by label, not by argument. Maybe it's radical; maybe it's right. The label doesn't settle it. Calling me radical avoids engaging what I actually said. It's ad hominem by political category."
by Dumu The Void March 2, 2026
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