Biting the Hand

Why would the police criticize something that causes people to drive the speed limit and stop at red lights.

Police talk about 'saving lives' while collecting revenue. I believe that all their talk of saving lives is just a red herring, a noble herring indeed, but as red as Karl Marx's blood. Here's a system that saves lives. The police tell us that red light cameras are a good idea because they save lives. Now if that's true, why do they complain about a system that reminds us to stop at red lights? Isn't saving lives their top priority?

Or does this system that reminds us to stop at red lights and reminds us to slow down cut into their revenue stream?

They are biting the hand that helps them simply because it wont feed them.