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Truth can still sometimes (often?) be found in the offensive. More importantly, talking about the "unspeakable" is an important counter-balance to society's desire to clam up. Issues of race, rape, and genocide should always be talked about and acted upon, not merely waved away with a dismissive morality as taboo.
Silverman might misstep, as all comics do, and comparing her to past greats is perhaps a bit much without more years in which to judge her, but I'd hardly say that she's a worthless hack. I'd say she's a provocateur in the best sense -- someone who pokes us with a sharp wit where we are most tender.