The objective evidence shows an increase in rear-end crashes but a reduction in injury and fatal crashes, offering a net overall benefit.

Council et al., 2005 -- https://www.fhwa.dot.gov/publications/research/safety/05048/...

> generally because the operators lower the yellow light time to increase fees

I'm skeptical of this claim because the red light camera operators are usually contracted by municipalities. They don't have any direct control over the light cycles.

(Yes, obviously they can be in cahoots with the municipality, but I would be surprised if that was common and not the exception)

Do you have any evidence of this?

Neither of you share any references for the objective facts you claim to be stating. At least link an article or a study.

can this not be regulated? yellow light timing must not have changed for the last 12 months before adding cameras

Maybe people should brake on yellow lights.