It’s not mental illness, though that’s a problem we should do more about.
It’s not even, as bad as that problem is, racism and xenophobia.
The simple, incontrovertible fact is that nations around the globe, throughout the history of humanity and its precursors, have suffered from emotional problems and delusional thinking, have become obsessed with ever-evolving forms of amusement and have found reasons to dislike, even hate, people of different hues, faiths and nationalities.
The bloodshed we are witnessing on an almost daily basis can be laid at the feet of a culture that refuses to deal with the fact that high-energy weapons of war have not just the power to kill many people in mere seconds.