The interesting thing about this anecdote is that the cops, according to their own accounts, actually have the power to choose their battles. If it is a slow day, and they have to meet some kind of quota, they are much more likely to catch those infractions. I have seen examples like yours, and I have also seen cops suddenly pop through the intersection towards red light runners.
Basically, whatever culture has developed, the action is still against the law -- not to mention reckless! -- and the cops can choose to enforce it.
I have seen cops going 10 MPH over speed limit on city streets without their lights on, but that does not mean I can do the same.
Now I may not like every law out there, but I can definitely see (and have personally experienced!) where there is danger in people not stopping at red lights or making sudden maneuvers in order to rush a yellow. I think this is a law I can support, and this lax culture that creates a higher incidence of "accidents" is not something I can support, partially because I personally do not want to be someone else's "accident".
Really, I am responding because your words suggest you are joining and assisting in this insanity, and I just wanted to let you know that not everyone approves of it. Things can change. You just have to want to change them.