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Do you think the opponent’s arguments will help improve your worldview? If so, the argument is useful.
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Is your opponent open to changing their view, and will your arguments help that? If so, the argument is useful.
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Is this an effective use of your time reaching other people compared to e.g. posting/commenting your arguments elsewhere? If so, the argument is useful.
Otherwise, the argument is not useful and you should consider doing something else.
Yeah, that makes sense and I tried to cover it with Point 3.