Sometimes a tragedy is just a tragedy, and not necessarily a melodrama pitting good against evil. We accept that when people are killed by tornadoes. Otherwise, however, many prefer the illusory comforts of a well-told tale -- particularly one that reflects favorably upon their own ethnic tribe or political cohort, and unfavorably upon others.So it's been in the infinitely sad death of Michael Brown at the hands of Ferguson, Missouri police officer Darren Wilson.