The well-known psychologist of the University of Toronto Jordan Peterson stresses that everyone (or nearly everyone) has experienced the same nihilism that has driven mass murderers.
The heroes who save lives, the mass shooters who take them, and cowards who run away from challenging situations all have something in common. They all experience the tragedies of life.
Suffering is inevitable. Death is inevitable. It is the reaction to the suffering that is different and, thus, completely changes the course of their own lives and the history around them.
Inside each of us are a villain, a coward, and a hero. Which one will prevail?
— Read on fee.org/articles/the-heroic-individual-is-needed-to-confront-the-evil-of-nihilism/