Speed Cameras - 'NOT IN USE' Sign...

Does anybody else think this hypocritical / stupid:
I've just passed two speed cameras, both lovingly covered with orange bags, emblazoned with the words 'NOT IN USE'. Thats fine, you say, but I thought the 'official' stance on speed cameras was about road safety, not revenue?
So regardless of whether the camera is operational or not, wouldn't it be more effective in slowing people down if we all just assumed that the camera was working all the time.
Rather than hanging out a 2sq ft invitation to go as fast as you can....
Just a thought.
:-?
TSC.
I've just passed two speed cameras, both lovingly covered with orange bags, emblazoned with the words 'NOT IN USE'. Thats fine, you say, but I thought the 'official' stance on speed cameras was about road safety, not revenue?
So regardless of whether the camera is operational or not, wouldn't it be more effective in slowing people down if we all just assumed that the camera was working all the time.
Rather than hanging out a 2sq ft invitation to go as fast as you can....
Just a thought.
:-?
TSC.