'''12.''' Many are disgruntled people with a sense of entitlement (see: [[Atheism and gratitude]] and [[Atheism and envy]]).<ref>[https://www.psychologytoday.com/us/blog/culture-shrink/201510/american-narcissism-and-mass-shooters American Narcissism and Mass Shooters], Psychology Today</ref><ref>[https://www.crimemuseum.org/crime-library/serial-killers/serials-killers-vs-mass-murderers/ Serial Killers vs. Mass Murderers], CrimeMuseum.org</ref> | '''12.''' Many are disgruntled people with a sense of entitlement (see: [[Atheism and gratitude]] and [[Atheism and envy]]).<ref>[https://www.psychologytoday.com/us/blog/culture-shrink/201510/american-narcissism-and-mass-shooters American Narcissism and Mass Shooters], Psychology Today</ref><ref>[https://www.crimemuseum.org/crime-library/serial-killers/serials-killers-vs-mass-murderers/ Serial Killers vs. Mass Murderers], CrimeMuseum.org</ref> |