Why call your opponent names and become emotional? It's not effective. In what world does personal expected value versus expected cost of breaking the law eve

Why call your opponent names and become emotional? It's not effective. In what world does personal expected value versus expected cost of breaking the law ever become a good way to make moral decisions? There are at least two counterarguments to this. 1) The law is written for precisely this reason. Most people do live by a cost vs benefit mindset, and the penalties of laws are generally tuned until people stop committing the crime. I wouldn't want to live in a world where the penalty for murder was only a week in prison. 2) Anyone who uses the law as a way to guide their own moral compass probably isn't very moral, because throughout history every society has had laws which are later agreed to be evil.