The Rav Abarbanel explains (the psychiatrist accept it also) lo siso alov chet, don’t label a person by name but question his behavior or actions. If you call him names placing the sin on him personally, you are taking away the ability from him to do teshuva. You can change your behavior or actions but not yourself. The Torah gives an advice how to avoid lashon hara by placing one next to another. If you judge a person for the good, you will not gossip about him.
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