California Gov. Jerry Brown scored a victory for common sense last week when he vetoed a bill that would have imposed criminal penalties on minors -- or their parents -- who ski or snowboard without a helmet. "While I appreciate the value of wearing a ski helmet, I am concerned about the continuing and seemingly inexorable transfer of authority from parents to the state," Brown explained. "Not every human problem deserves a law." That veto endeared Brown to conservatives who have grown wary of the Democratic Legislature's nanny-state ways. It also highlighted how unpredictable Brown can be. There are two...