The whole reason society created politeness is from experience. We learn that life is not filled with absolutes. We learn that people and circumstances change. We learn that doing the right thing is often impossible because of imperfect information. Social censure like he endorses makes the world a very unpleasant place to live.
And people who are not violent wont attack you even if you are rude.
My first impulse would be, yes, be polite at first, even while you are telling him or her that they should be thrown in jail. You can be polite even as you are strapping someone to an electric chair. Rudeness would be used only in reaction to their rude behavior, in a repeated-game-theory way.
But I'm not sure that 'politeness' and 'rudeness' is clearly defined. Some people might think 'because you raped that woman, I'm going to advocate that you be prosecuted' is rude; I don't. It would be rude if you added 'you bastard' to it, or gloated, etc. Understandable, but rude.
This thing here is not politeness, but rather a political correctness. And indeed it does have its advantages, but also disadvantages - like the overwhelming tolerance towards white collar crime, or turning a blind eye to crimes by institutions like Catholic Church.
Life is not filled with absolutes, but people who are scum usually remain scum, and we should have no problem with publicly naming them when it’s an effective way of reducing the harm they pose.
Logically this exempts everyone from being polite to everyone else, as per various state and federal laws, everyone is guilty.
This is entertaining, though. Will people go around asking /r/amitheasshole questions to AI or is the social interaction the fun part?
Don’t blame yourself for being misinformed: there was a period where anthropological and archaeological evidence was believed to indicate humans are naturally non violent. Recent evidence and analysis has proven otherwise. Humans are capable of both incredible kindness as well as violence.
See: https://www.smithsonianmag.com/science-nature/ancient-brutal...
Other people will beat you, because they have opposite.
Do not blame yourself for thinking archeological evidence has anything relevant to do with the actual topic at hand. It does not. And plus, it does not prove or disprove what I said. You just misunderstends what archeology can or can not prove.