A bad movie will be bad forever--it can't do anything tomorrow or next year that might be good (or even a little less bad.) It's different for people. A person who says or does bigoted things today can behave better in the future. Does one act of bigotry define a person as "a bigot" forever? (Who among us has never done anything at all bigoted?) As a matter of strategy, focusing on evil actions rather than evil people is usually a more effective way to change behavior.
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