Paul Dallison writes  Declassified , a weekly satirical column. The photo op at a school is a classic for politicians looking to make the headlines without being bombarded with tough questions by the (boo! hiss!) media. So why do so many politicians and diplomats get speaking in front of children wrong? The chancellor of Germany and the British ambassador to Washington are among those to have made unusually candid (and in the latter case, just plain unusual) remarks to kids. Here’s a look at