It sounds to me like he blamed others for his problems and decided to take them down or he was just a sociopath.People that go on shooting sprees are clearly sociopaths in most cases who care nothing about human life where as a person that only kills them self was either mentally ill or felt that death was the only option.It seems like a modern problem thanks to media but I am sure even in cave man days some person that was sociopathic just bashed others in his tribes heads in or used a spear or what ever and no one would ever know that it happened.
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