These are acrimonious times on TV. Nora Dunn jeopardizes her career in preference to appearing with Andrew Dice Clay on Saturday Night Live. On the Second International Rock Awards, Elton John calls host Sam Kinison a “pig” over the air. The Simpsons are starting a family feud with the Huxtables. The sniping between Roseanne Barr and Arsenio Hall has degenerated into unprintable invective. Even the usually taciturn Ken Wahl is grousing about being dumped from Wiseguy. Maybe we should call in Mister Rogers as a mediator before things get out of hand.