Speed cameras have no correlation with accidents

Cause or are placed in high risk zones where the presence of a camera more or less guarantees there will be a record of any incident?

I would like to see the studies proving this or at least hear the reasoning

Speed cameras do not. You are thinking of red light cameras, but it is really a wash. There are less right-angle crashes “t-bones” but more rear-end collisions because people tend to stop shorter.

Either way traffic enforcement cameras definitively save lives. There have been numerous studies.