It's an idea that, in the death-squeamish U.S., is probably too disturbing for the edgiest TV hospital drama, let alone real life and real legislation. Last week, the Belgian Parliament passed a law allowing terminally ill children to request aid in dying. Adults there have been able to do that since 2002, and a few other European countries have similar measures. But last Thursday's action, which is expected to be signed into law by King Philippe, will make Belgium the first to extend the right to minors faced with "constant and unbearable suffering." International headlines ensued, including some rather aggrieved...