It has been documented that these cameras cause more rear end collisions because of this fact.
That's because of people speeding. The faster you drive, the less time you have to react to the light changing or the driver in front of you stopping. In fact, the time you are given to react can even be negative if you drive too fast.
Therefore, if safety is the goal (big if), red light cameras should also be speed cameras. Without people speeding as they approach traffic lights, there will be far fewer rear end collisions and far fewer red light infractions.