There are many reasons why people like to kill people: greed, anxiety, misperceptions, pain etc., are common. Here I shall focus on a particular reason. A 27 year old German co-pilot locked himself in the cockpit, and while the captain pounded on the door, flew himself and another 149 persons, including tens of babies and children, into a cliff at the base of a mountain that towered another 1,500 meters higher.
Insanely enough, the murderous maniac may have view it as an act of love. Dying among those mountains he knew well, and loved. The area may be the most famous in the world for glider pilots: enormous mountains with a warm sun create tremendous updraft. The valleys are full of airports. Wingsuit flying was invented there.