[KampfHase]

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written to solve a specific problem

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So, which specific problem would that be? I mean, the problem in hand is a specific problem, is it not?

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I feel sorry for you

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No need to.

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letter of the law is more important than the spirit

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The law is supposed to be the written form of the spirit, isn't it. If you have a different spirit, don't set this rule. I'm fine with that.

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Reckless1der said he saw the winning Ace, I doubt he's the only one who saw it. So he can't say he didn't know he lost.

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It's not a matter of seeing or knowing that you lost. It's a matter of not showing both cards.
I am not trying to take away a pot from the best hand. That so-called best hand was technically not present, since it was (partly) mucked. If the guy had turned over the second card of his two pocket cards before he mucked both, I would definitely award the pot to him.
I don't think that this is a mindless application of rules; the guy who mucked (part of) the winning hand was mindless and not aware of this rule - his own fault. Even if OP wouldn't care about the pot, I would award the pot to him, because technically he has the only live hand and therefore the winning hand.

Fact is, one of two cards was shown. Then, the whole hand was mucked. All cards have to be shown at the showdown to be entitled to win any part of the pot (before card's are mucked, of course!).

Whether OP was behaving like a nit, or whether he was tilting doesn't matter (it's a matter of etiquette). The other guy didn't abide the rule.

I know that this rule is really nit-picky. If you don't wanna be this nit-picky, don't set the rule. That easy.