SEASON PREMIERE: To start its second season, The Carmichael Show has gotten more attention by revealing its intentions outright: Each episode will have a theme, and the episode will attack that theme like a modern-day Norman Lear comedy. Saying it is one thing; accomplishing it is another. Tonight’s subject is infidelity – but the real test comes Sunday, when the topic is “fallen heroes”… and the discussion turns to Bill Cosby.