It was also an intersection that had tons of accidents from people running the light before the camera was installed.
https://saferstreetsla.org/679/case-studies-longer-yellow-li...
Also increasing yellow light duration is significantly cheaper than contracting out a network of cameras to a vendor who takes over half the revenue from each ticket.
It's cheaper for society, yes. It's much more expensive if you're the government notionally "paying" for that contract. It's paid out of revenues you didn't have before.
The idea is to stop people running red lights everywhere, not just at red light locations.
If you run red lights, you should be banned from driving just like if you speed. The roads are unsafe enough as it is.
If it was about safety, it would only hit people when the crossing traffic light turned green.
If red light cameras were about safety, the addition of warning signs "Red Light Camera Intersection" ahead of the lights would drastically reduce the amount of dangerous behavior.
That isn't how the incentives work, though. Instead they hide them, throwing away the powerful deterrent they've created, in an attempt to make money from the unwary.