Martin Dyckman: As rhetoric descends, up pops evil
John Kasich has taken heat for a web ad that subtly compares Donald Trump to Adolf Hitler. Narrated by a former Vietnam POW, retired Air Force Col. Tom Moe, it paraphrases German pastor Martin Niemoller’s famous statement of regret that he did not speak up for the tyrant’s victims until he became one “and there was no one left to speak for me.” Hitler analogies should be rare and expressed carefully lest comparisons to lesser evils trivialize his monstrosities. Too…