What's the harm of not being polite?

The harm of not speaking civilized manners: 1. For the society: it affects the social atmosphere, which is not conducive to the progress of social civilization, and at the same time affects the image dignity of the country and the nation; 2. For the group: uncivilized behavior is prone to contradictions and misunderstandings, affecting the harmony of interpersonal relationships, easily leading to disunity between people, the breakdown of friendship, the loss of righteousness, and even irreparable consequences; 3. For individuals: it is detrimental to personal image and is not conducive to personal growth and development.