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If a person doesn't have the freedom to be evil, then he cannot be good.
Being good or evil is defined by one's intentions, not the results of one's actions. Without freedom of choice on a delimma, one can not have real intentions about it.
If good and evil is collectively determined and not internally defined by the individual, then the results of your actions must define whether or not you're good.
T.S Eliot for reference on the point