The night Bernard Parks should have apologized to the district attorney for trying to derail the state constitution, he left his uniform hanging in the closet.The police chief wore his civvies when he made his evening appearance outside Rampart station — where he’s been rather scarce lately.Parks said he would cooperate with D.A. Gil Garcetti, whom he continued to accuse of stifling the investigation of Rampart corruption. He refused to say he was sorry for saying he wouldn’t cooperate; indeed, he denied ever saying anything like that. Maybe that was supposed to be a joke.