There can exist a third category in which things are neither just nor unjust. It really depends on whether your logic system is two-valued or many. There isn’t any universal standard. Can’t you see that there are distinctions in strength between trust, don’t trust and distrust? If you’ve never dealt with someone before, you might not trust them. But you wouldn’t distrust them without specific reason.
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That depends whether you consider things must either be just or unjust or whether they can simply not be just, without being an injustice.
I don't see what the distinction you're making is. It seems things are either just or unjust. That seems like standard logic.
There can exist a third category in which things are neither just nor unjust. It really depends on whether your logic system is two-valued or many. There isn’t any universal standard. Can’t you see that there are distinctions in strength between trust, don’t trust and distrust? If you’ve never dealt with someone before, you might not trust them. But you wouldn’t distrust them without specific reason.