You are right, but there were also several studies done that proved the speed cameras lowered speeda significantly, even after the camera had been relocated.

Lets not let perfect be the enemy of good. Those cameras reduced speeds and generated revenue for the city that was specifically dedicated to making streets safer, including bollards, lane narrowing and speed humps. The removal of the cameras both made the streets more dangerous, and cut funding for real safety improvements. All because speeders were getting caught speeding and considered that unfair.