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Maybe your strategy is not the most common but it does not mean that it is illegitimate.

I think the most sensible thing would be to close the discussion and avoid sending messages to the wallets of people who do not agree with that.

I also believe that you are in all your right to reject this type of action, if you perceive that there is risk in them.

There is something essential in human relationships and it is mutual respect.

Then he should respect the space of other users and stop invading their wallets and comment threads with unsolicited spam. This is a far more serious offense than your group of misguided users seems to realize.