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I submit that if Viliam hadn't understood that he wouldn't have felt the need to say "... unnecessarily rude".
Do you think it is at all likely that by writing the way he does Eugine is keeping LW's Overton window in a better place than it would be if he stated equivalent opinions without going out of his way to offend?
"Unnecessarily rude" is like "excessive force" or "inadequate approach", if you accept the expression you accept that the subject is wrong by definition.
I think that politeness is not an unalloyed virtue and that being rude can be useful. I am, of course, not saying that every time you have the opportunity to be rude, you should.
Since I'm quoting Greg Cochran, here's more on the topic.
""Maelcum a rude boy, Case." X-)