Some people benefit from being naturally mentally tough, but it can be taught to those who aren’t

The saying that “whatever doesn’t kill you makes you stronger” is simplistic, disingenuous, and potentially destructive. While it’s true that some who experience horrible events are stronger for surviving them, this is probably only true if they were strong to begin with. In the face of horrible events, others are more likely to be traumatised and suffer for years or decades after.