Changing their minds isn’t really the point of it, it’s more about giving the other people possibly seeing the thing a better chance to realize what they’re reading, so they might not believe the disinformation as easily.

Obviously fighting constantly against a crowd consisting mostly of trolls and idiots you can’t even tell apart would take a heavy toll on anyone - I fully agree with it being a sisyphean task. Personally I just tend to block the major communities harboring them, and do only small stuff like these comments pointing this pattern out