What's wrong with people?
Well, a whole bunch of stuff from what I see...
Something I feel is obvious is the effect of population growth.
1960 had the earth's population at 3 Billion, 64 years later, 7.5 B...
We seem to get better and better at getting on each other's nerves and expanding the "limits" of behavior.
The internet has made it crazy quick and easy to spread good, bad and made up stories.
We (me included) don't spend enough time outdoors or talking in person with our neighbors and communities.
My knothole likely looks different than yours.