Watch FBI Criminal Profiler Explain The Reason Behind Many Mass Shooters: "Involuntary Celibacy", Young Men Who are Isolated Because They Have Been Rejected By Women "Incel"  or involuntary celibacy is a relatively new term that profilers use to describe killers who violently act out against the general public.  This expert has studied mass murders and a common theme is that many men feel rejected by women at a time in their lives when they have a strong desire for this connection.  It isolates them and their anger in turn gets channeled elsewhere.  One example he gives is Ted Kaczynski (The Unibomber) who claimed in his Manifesto that his motive for killing was hatred of government and technology..  The underlying issue was that he was rejected by women and therefore became disconnected from society.   Watch here @ 11:35 https://www.youtube.com/watch?v=OiEqtdcHeDk&t=11m35s