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Well, they are complaining about it on Reddit anyway as you can see on OPs post.
In german we have a saying "Gelegenheit macht Diebe" which basically means that sometimes it's the opportunity to steal which turns people into thieves. This is basically what happens when you create a new wallet and find somebody elses. You stubled accidentally into the opportunity.
User error, blocked.
This is what I have never understood. Hearing out users, especially when they are paying customers, is important and there is nothing to lose, not even real significant time. If they turn aggressive, just wait a bit with response or even skip response, but the signal is always worth incorporating, even if it is just "you stole my coin you piece of shit" - even that is a datapoint.
I've been searching reddit and bitcointalk for instances of this and haven't found any yet. but my search is far from over.