I'm leaning more towards him being a paranoid schizophrenic. True, he showed signs of psychopathy, but his behavior and his actions prior to the massacre suggest that he was a disturbed individual. And as I mentioned earlier, I believe that in his twisted mind, he felt that by taking his own life, he'd be a legend of sorts. I don't believe that he was afraid of prison in the least. His death was probably the last phase of his "plan" to achieve some sort of sick glory.
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