If a person is speeding and unknowingly gets tagged by a speed camera, it doesn’t stop their speeding at the time. Hence it is not about safety.
If someone is speeding then slows down just long enough to avoid getting tagged by the speed camera, then resumes speeding, it is not about safety.
If the tickets can be literally thrown in the garbage without a second thought and the issuing party can’t do a thing about it, it is not about safety.
There are better ways to make people aware of their driving habits. A shitty unmanned speed camera is not one of those ways.