I am currently reading the book, "Dead Wake," by Erik Larson, which is about the sinking of the British passenger liner Lusitania by a German submarine in 1915.
I keep coming back to the question: What cultural background, education, family values, religious faith and ethnic origin could have convinced the submarine captain that is was perfectly OK and even "heroic" to torpedo a passenger ship full of civilian men, women and children?
So then, what background influences of education, family, friends or faith could convince a man that it is perfectly OK and even "heroic" to enter a place of worship and murder nine of his fellow citizens?
These were not individual acts. Each had a background of supporters and enablers. Each had a community that said such acts were justified. "No man is an island, entire of itself. Each is a piece of the continent, a part of the main," wrote John Donne in "For Whom the Bell Tolls."