There were times that the reason for tragedy was very well known, and in fact foretold. That didn’t make it any less sad. Yirmiyahu Hanavi, after warning about the Churban for years, cried over it when it happened.
The Mishna says that Hashem expresses a sadness when a Rasha is killed in Beis Din.
It doesn’t make a difference what the reason is. For those suffering it is not a time for Mussar, either. But you do have to realize that the world is run by Hashem.