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It's not clear that he or she does.
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But if not, then being angry--again,
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I would certainly understand it if you got angry,
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in the sense that it's a perfectly common enough response.
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But is anger an appropriate response to your roommate
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for giving you something, and then not giving you more?
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It's not clear that it is an appropriate response.
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The appropriate response actually seems to me to be, not one of anger,
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but gratitude.
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Your roommate didn't owe you any candy at all,
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and they gave you four pieces,
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or whatever it was, the number just was.