If the miner (or pool) accidentally included an excessively high fee in a transaction that was confirmed by someone else, would they want that someone else to return the excess?
A little puzzled as to the question, but I'll try...
So a miner creates a transaction that has a mistaken excessive fee (i.e. in the role of a 'user'), and some other miner mined that transaction into a block? Is that the scenario? And you're asking if the first miner would want the second miner to return 'the excess' (whatever 'the excess' might be, which is an interesting question unto itself)?
Of course, miner one would
want miner two to refund him the fee. And miner two would again be perfectly justified -- legally and morally -- from refusing to do so.
Why you might think the fact that the erring user also happens to mine would change the calculus in any way is beyond me.
Not exactly.
More specifically, I'm stating...
The transaction posted by the OP was mined by AntPool.
Assume for a moment that the operator of AntPool were to create and broadcast a transaction that accidentally paid a 10 BTC transaction fee.
Assume in addition to that, the transaction with the 10 BTC transaction fee was confirmed by some other (Non-AntPool) miner or pool.
Would the operator of AntPool want that someone else to return some of that 10 BTC fee?
Of course, miner one would want miner two to refund him the fee.
Good. So we are in agreement that the operator of AntPool would want such behavior of others.
Would the operator of AntPool feel like the honorable and "morally good" thing would be for that someone else to return some of that 10 BTC fee?
If the answer is yes, then he is morally obligated to do so for others. If his morals and values lead him to believe that returning some of the excessive fee is "right" and "good", then failing to do so would be immoral, dis-honorable, and "wrong". Choosing to do what you know is wrong, just because you believe you can get away with it (legally or otherwise), doesn't make it "right" or "moral".
One may choose not to act on a moral obligation, but in doing so they are acting immorally within their own structure of values.
Now, I'm not stating that AntPool objectively DOES have a moral obligation. I don't know them or their belief structure personally. However, within my understanding of good and bad, I'd feel a moral obligation to return the excess. I strongly suspect that returning the excess is within the concepts of "right" and "good" of the operator of AntPool.