People that perpetrate a massacre are not textbook type crazy individuals, they are usually intelligent and carefully plan the attack. The fact that most are sociopaths by definition does not make them insane or loony.
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Right or left leaning plays no part in their actions, they are unhinged and over the edge of any of our norms.
Hatred is acquired, no child is ever born hating anything its their influences as they grow older that shapes this distorted view, whether its hatred of another color person or their religious beliefs, so many people are just lost in this world and this action for them, is the answer.