What a fascinating discussion.
The purpose of nichum aveilim is not about the niftar, but about the oveil. If saying something lofty is praiseworthy to the niftar but painful to the aveilim, I suggest that this statement be avoided. That’s probably why the halacha is that the visitor being menachem should not initiate the conversation, but rather the oveil. This guides the interaction to be according to the wishes and desires of the oveil. Making a comment that the passing of the niftar was somehow positive is not appropriate at this time.
Lastly, we are all victims to the tendency to try and identify causes for the tragedy. This is shameful. Many gedolim specified that this was clearly a gezairoh, and we have no way to know why. The suggestions they offered for people to be mekabel on themselves are not repairs for the flaws that prompted the gezairoh, and most stated this clearly. To address causes during aveilus is misguided.