I disagree. They're put in places where it could be argued that the speed limit isn't correct anyway, such as the slip road I mentioned. They don't seem to be in places that are accident blackspots, so safety camera is by far a bigger misnomer than cash cow or money spinner.
That is probably a problem in your local area. The nearest one to me has been placed on an accident hotspot (a staggered crossroads) when local residents (including me) feel it would be better sited on the approach to it because that's where people speed, arriving at the hotspot unable to stop within what they can see to be clear - as is common, with many drivers now seemingly driving so fast that they can only stop within what they can't see to be obstructed yet.
They get more news because those sort of traffic infringements are easier to 'Police' than the many that are committed by walkers and cyclists, which skews perceptions.
It would be very easy to sit on any major cycle commuting route just after sunset and catch people for lack of lights, "chipped" e-bike motors and defective brakes, and create a big local newspaper splash for doing so, but it would have almost no effect on road casualty rates.
As for walkers, I struggle to think what "traffic infringements" they can commit apart from obstructing traffic which is very rare outside protests.
The reason why motorists are policed more is that they kill and injure more. Even then, policing is not proportionate to harm or offending.
If they were successful at reducing speeding, they'd be self defeating, as they wouldn't raise the revenue required to operate them.
I think we pay a five-figure revenue sum to fund Norfolk camera operations, as well as the five-figure installation capital cost. Again, maybe this varies by area and some areas aren't willing to fund hotspot cameras. I can see why revenue-neutral cameras would be troublesome.