ABC television star Roseanne Barr is in full retreat. Today, she tweeted, “I apologize to Valerie Jarrett and to all Americans. I am truly sorry for making a bad joke about her politics and her looks. I should have known better. Forgive me-my joke was in bad taste.”

https://twitter.com/therealroseanne/status/1001471669641216005

A mere matter of taste? On Tuesday, she had tweeted, “Muslim brotherhood & planet of the apes had a baby=vj.” Jarrett was a top former aide to president Obama.

America is awash in a sea of vilification, much of it being disseminated from the White House, where Donald Trump offers what amount to daily lessons in the objurgatory arts. Unlike Roseanne, who is now threatening a self-imposed Twitter exile, it seems to work for Trump whose natural habitat is the netherworld of calumny and........

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