Here is a philisophical view to consider.

If everyone was always polite, how would we know if someone was being polite?

Unfortunately, evil defines good.  Can not seem to have one without the other.

This is the reason the first Matrix failed, humans define their existance through suffering.

We had our one chance for bliss in the Garden of Eden, then someone had to eat an apple.  Your only other chance at a perfect society is heaven.  And getting there is no walk in the park.

I am sorry to hear that people experience things like this in a game, but quite honestly, I would rather hear of these sad events happening in a game than in real life on the news every night.