The Magic Mute Button

I see so many comments about the magical Mute Button that solves all problems and is the perfect "self-defense" against toxic players. This makes me wonder... if there is a magical button that instantly solves all issues, why do we need a report system at all? Just mute people who offend you or are flaming you or whatever else? Why do they need banned? Food for thought (that will likely get ignored or downrated without actually being considered).
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