mdd, would you find it appropriate to actually say that to someone, though?
Regardless of who wrote it, and I obviously have the utmost respect and reverence for Rashi, you simply do not ever say something like that to a person who is grieving, for any reason.
Regardless of what is written or said, a community and a family are in mourning and any sort of statement of “this happened because of ____” are tremendously hurtful and inappropriate.