The courage to go after sacred cows is one of Donald Trump's more appealing, if controversial, traits. He raised the issue of NATO, contending the USA pays far too much of the freight in the mutual defense pact. Such proposals, the candidate has made clear, are not so much policies as "suggestions" or what one might call, from his business perspective, negotiating positions. Regarding the NATO suggestion, frankly, I am of two minds. While it's clearly arguable the American contribution is excessive, the investment might be necessary for the preservation of the alliance (weak as it is) and to maintain...