Separately I was thinking about libertarians vs. anarchists – they have many purportedly shared values, yet are far apart from each other. This definite vs. indefinite optimism (or maybe definite vs. indefinite good) could be a way of distinguishing them.
Libertarians are very indefinite, they studiously avoid making any assertion about what a good life is, what anyone might want to do with their freedom. Anarchists... much more definite, with opinions about what freedom actually means.
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