Wilshire & Alvarado - May Day The presence of a police force lined up with riot gear presupposes trouble. And when someone supposedly threw a bottle near MacArthur Park Tuesday evening, it was a call to action. Or as Chief Bratton later rationalized: "Missiles were being thrown at the officers, and officers [were] responding." Last year's May Day march down Wilshire featured amiable members of LA's finest police and fire squads lined up on......