A good example would be using violence to prevent or punish theft.
Some people solve this by stretching the meaning of "violence" to include theft... but if one follows this path, the word becomes increasingly unrelated to its original meaning.
Generally, it seems like a good heuristics to define a set of "forbidden behavior", with the exception that some kinds of "forbidden behavior" are allowed as a response to someone else's "forbidden behavior". This can help reduce the amount of "forbidden behavior" in society.
The only problem is that the definition of the "forbidden behavior" is arbitrary. It reflects the values of some part of the society, but some people will disagree and suggest changes to the definition. The proponents of given definition will then come with rationalizations why their definition is correct and the other one is not.
I guess it's the same with "judgement". The proponents of non-judgement usually have a set of exceptions: behaviors so bad that it is allowed to judge them. (Being judgemental, that is judging things not belonging to this set of exceptions, is usually one of them.) They just don't want to admit that this set is arbitrary, based on their values.
I was with you until you said the choice of forbidden behaviors was arbitrary.
No, it's not arbitrary; indeed, it's remarkably consistent across societies. Societies differ on their approaches to law, but in almost every society, randomly assaulting strangers is not allowed. Societies differ on their ideas on sex, but in almost every society, parents are forbidden from having sex with their children. Societies differ on their systems of property, in almost every society, it's forbidden to grab food out of other people's hands.
There are obviously a lot of b...
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