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

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Funny I remember someone earlier in this thread telling me a hand once dead it was dead. Cash or Tournament mucked is mucked ? or was I misinformed. Angus wanna chime in on this?!?

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It would not suprise me if someone said that. Almost every day I hear someone say "if it touches the muck it is dead." You hear a lot of people taht are wrong abotu a lot of things if you work in a poker room.