Why do mainstream listeners find it difficult to consider extreme metal music (e

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Why do mainstream listeners find it difficult to consider extreme metal music (e.g. death metal, black metal, etc) aesthetically pleasing? Some forms of progressive death metal (e.g. bands like Opeth) do an excellent job of balancing truly 'beautiful' and 'sublime' elements. Can it be, that due to an aversion on worldview level, people do not recognize the aesthetic elements?