It’s the single question that haunts all Americans as they turn the page on a dreadful year: Why is “Wonder Woman 1984” so bad? Why did this eagerly anticipated follow-up to the delightful 1917 “Wonder Woman” — starring the same stunning Gal Gadot and directed by the same Patty Jenkins and released for our homebound viewing on HBO Max as a Christmas Day gift to its subscribers — have to stink up the joint like no comic-book movie has since “Howard the Duck” in 1986? You know things are going wrong at the outset, when we find Diana Prince, Wonder...