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It's the same reason the Clintons have hysterical appeal to many. They are a validation of the corrupt dysfunctional lives their supporters are living.
There's no comparison between the Osbournes and the Clintons. With the Osbournes, evil is just an act. The Clintons are true evil, deception and lies. Ozzie is a good guy deep down, and Sharon isn't smug and lecturing.