When it comes to identity theft, Missouri has the dubious distinction of leading the nation — tying for the most complaints per capita in the nation with Florida, Connecticut and D.C. And that may well be because the Show Me State has failed to take simple measures to prevent, and root out, such fraudulent behavior. Twenty-seven states allow parents or legal guardians to place a security freeze on a minor's credit report — a key protection since minors are easy targets for fraud.…