“Now that the Los Angeles County Board of Supervisors has defused Mike Antonovich’s potentially embarrassing attempt to change the focus of Los Angeles Opera’s Ring Festival from Wagner…, I hope it is safe to point out that the company’s troubles may not be completely over. Unfortunately, its next installment in the cycle, ‘Siegfried,’ opens on Sept. 26, in the midst of the Jewish High Holidays” — and it’s the “most problematic of the cycle” in terms of stereotyping.