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I'm not recommending that anyone do this, but in my mind it's a non-villainous thing to do.
I agree with your general perspective. Consider the following hypothetical that seems somewhat analogous:
A fire is raging through your area and a bunch of cars are in its immediate path, so you hotwire some and move them to safety. After the fire is under control, you attempt to return the cars to their rightful owners.
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Sure. But what if I front-run your claim? I think you're underestimating the liability you get from preventively confiscating someone's coin and then asking for evidence in order to return it.
If you took my property and then put conditions on the return that prior to your actions were not imposed on me then that is a big big big problem, like shotgun KYC.