The presidential Twitter account, 1:37 p.m. today: “New movie about our wonderful moon landing will not show the American flag being raised. Not good! Time to plant a boycott flag in Hollywood’s ass!”And you know what? He’d have a point — even though, let’s face it, this is more a business decision than “political correctness run amok.†You want your movie about one of America’s greatest moments to sell tickets in countries that aren’t crazy about America (cough)? Well, then you’d better go light on the American iconography.The first step in writing a post like this is deciding whether...