Why exactly is it bad etiquette to ask to see a losing showdown hand?

[brettbrettr]

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It depends on the situation. If a guy bets into me like crazy and I make a tough call, I have no qualms about asking to see his hand. I wanna whether he was betting with am naked AK, flush draw, 22, etc.

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If he bets and you call, he's going to either say "no pair" or "you're good" or "i missed" or whatever. But you're basically going to know what they had and a bettor *has* to show first anyways.