So, it's a New Year. People like to make resolutions. I'm going to make a resolution and I invite everyone else to join me.
This is a game that can get heated. It instills paranoia and doubt in people and is a recipe for high emotions.
But it is also a game that requires people to eventually overcome that paranoia and doubt and work together to a common goal.
That means convincing other people on a course of action. And one of the Aristotlean aspects of argumentation is pathos or appeal to emotion. We all make mistakes or engage in fallacies or just simply have different points of view. But we aren't going to get anywhere by calling other people, their suggestions or positions "retarded."
If you present to me a reasonable course of action that I want to take, but I have questions or doubt it, calling me "retarded" is going to make me want to reject it just as an emotional reflex.
It doesn't help the game.