I’m not sure that we have much of a grasp on how huge the world is or how many people inhabit it, and hence on the miniscule likelihood that we could have been that old couple that were beaten up, or that soldier that was beheaded or on that plane that disappeared.
We see all this bad stuff in the news in a concentrated and sensationalised form and we think it’s going on all the time.
IMHO It’s good to keep an eye on what’s going on in the world, but you have to stay grounded. How many people do (did) you know that have been murdered? I don’t know of any.
The worst for me is news of all the cyclists that get knocked down on the roads. Keeps me off the roads if i can help it.