Situations can change, as can our understanding of the situation. What seems benign at one point in time can seem like a bad idea with more information. Revisiting decisions based on new information or a changed situation seems like a hallmark of good governing to me.
Consider Freon. It was legal to use for a long time. With evidence that it's bad for the environment, it's no longer legal for most uses.
Consider Freon. It was legal to use for a long time. With evidence that it's bad for the environment, it's no longer legal for most uses.