I’ve found the recent letters decrying the comparison of Trump to Hitler highly amusing. Actually, they’re a sign of America’s decline into a second-rate power, but I figure we better laugh while we can, especially since people are so willing to humiliate themselves publicly. Growing up in the 1950s after World War II, every American learned how Hitler came to power. It was unavoidable. WWII was the equivalent of a million 9/11s, and no political and military history had ever been so meticulously documented in film, photographs and print. So what causes Trumpists to take umbrage at such comparisons? The...