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I'd take issue with your use of "stupid" in this case.
Gestures change meaning over time and across cultures.
Right now thumbs up means approval. And there is some cutsie tie-in with gladiator battles. It's not a case of "Forget what's real, and twist it all to fit what's pleasant" at all, since the "reality" is a historical "reality", lost in the fog of history, and not all that relevant to the matter at hand (a visual joke of sorts) anyway.
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