Just because something is in God's plan doesn't mean it has to be good.
It will ultimately serve some good, but the event itself will not be always good in itself (Sept. 11, for instance).
But, God is sovereign. Whatever he wants gets done.
That does not mean we sit back and never fight for what is right. But, sometimes He allows evil to trample over the good to serve his mysterious purposes that are greater than we can understand. One way or another though, he will bring good from this case.
If you are looking for meaning in all this, the only thing that occurs to me is that we are having our culture of death rubbed in our faces and each must decide where they stand. We have been warned, we have seen close up and personal the face of evil. The next move is ours.