A question of Poker Ethics

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The fact of the matter is, if you put him on a A and thats what he had there was no way he was folding his hand anyways and you should know that. Theres no possibly way someone is laying down the second nuts in this case and putting you on a 3.

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What if i was wrong? what if he had a 9, or 1010-KK? what if my approach had made the diffrence? isn't it better to error on the side of caution, then the side of persumuiousness? thx for the post