Unless you're being sarcastic, they were not only two different types of vehicles that even I could discern in "dim lighting", but all police cars have spotlights and they could see there were to older women in the vehicle (think long hair versus short Dorner hair). There is no excuse and that's why LA paid the money up front. Those cops simply screwed up. They should be kicked off the force and lucky to get a job at McD's.
You're assuming they were functional and used, aren't you? You're doing exactly what you are accusing the cops of doing.