You know, I've read this about 5 times and what I get from it is: "We'll tell you only what we think you should know. And if in that message from Heaven we've been told that millions will die and it cannot be prevented, then there's no point in warning you. So shut up."
The disturbing part is that doing so directly defies the Blessed Mother's wishes. It doesn't matter what mortal men think. When Heaven gives you a request, you do it. There should be no second guessing.