I think alot of has to do with; there would be people that would have to admit that they have been wrong and have been poisoning and killing people for all these years ...
fillings/shots

If all these people (government and doctors and businesses etc ...) can slowly get out from under this then it will slowly go away from them and they wont really be to blame (at least in their eyes).
Especially if as they are slowly removing it from use; there is all these studies and doctors and businesses still saying that it is safe. So by the time the truth comes out; there wont be anyone left holding the bag.