mixed_biscuits
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The 'should' is because it's an assumption, the same assumption made with the argument you stated. Some people define race that way; what authority do you have to stop them?False. First, why should we accept that actions define race? There's no reason. Second, what we are studying here is literally social conventions, so I'm not appealing to convention in lieu of an argument, I'm explaining the conventions that tell us how to define race.
I don't believe that Butler intends her arguments to be merely descriptive; she wants things to change as a result.