What exactly causes a person to want to kill other people? What is the psychology behind it?
Probably some sort of child hood trauma. Or, you could just simply be sick.
I really don't think anyone will ever know. People can turn all the sudden for no reason. Most of the time it's chemical imbalance of the brain. Or maybe something traumatic that happened in their past life and they can't deal anymore. It's almost like they don't want to commit suicide themselves, so they turn into a mass murderer to hurt other people. Sometimes it's when they go over their breaking point, someone pushes them into doing something. Other times it's not getting what they want from other people that make them snap.
they are lacking the part of their brain that makes them acknowledge other people. they dont have ability to have sympathy or empathy on others, they view people as objects and dont understand others have feelings or thatg they are hurting other people.
or they are evil. and do it for fun
narcisistics and psychopaths are very similar
Usually someone who becomes a psychopathic murder tends to lack simple things that most normal people have, like compassion and sympathy. They may also lack the ability to make decisions and determine between right and wrong. Most murderers have very severe problems dating back to their childhood, such as abuse. They are not given enough attention/too much attention, they have a parent that dies at an early age, their parent(s) are abusive and alcoholics/drug addicts. The list goes on, but usually it can be linked to their childhood.