Actually, the big one I mentioned was from an professional engineering organization. All large engineering groups do a lot of studies before making recommendations of what policy should be adopted. God help us all of the politicians decide engineering matters. The politicians may have grabbed onto this as a way to make money, but there are real benefits independent of that, whenther you believe it or not.
I have no doubt that if you and the Internet were around when the first traffic signals were introduced, you would have said exactly the same thing about them. If you have ever tried to get through a busy intersection when the power is out, you should understand why they are needed. You may not understand red-light cameras, but they are no different. The goal is to pass the maximum number of vehicles through an intersection with a minimum number of accidents.
Numerous studies to the contrary here: