If you’ve been worried that there isn’t an easy enough way to help your kids understand the thorny issues of overt racism championed by presumptive Republican presidential candidate Donald Trump, Netflix — as it often does — has a show for you. The Emmy-winning Netflix original show “All Hail King Julien,” based on the popular DreamWorks movie-series “Madagascar,” debuts its third season Friday. And there’s an episode about Trump. Although the King Julien character was not originally intended to be a Trump parody in the “Madagascar” universe, the show’s creators decided the royal lemur could be a perfect teaching tool...