Now you say that arguing is bad and we should stop it because it leads to dissention and divisiveness. There is a lot we can learn if we can stop choosing sides. However, if someone is arguing and doesn't subscribe to the same opinions, then they are promoting disunity and are on the road to bloodshed that you described. No, that's a misinterpretation I often relate with people who share my opinions. And, in the best of all conditions, we are able to doubt our own beliefs in order to seek more satisfactory knowledge.
Some people are just plain contentious.
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