First I made no claim. It is you, u5a1a1, that is attempting to equate "mental illness" with mentally disturbed. 
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Hint: The two are not the same.
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If you have an issue with Ms. Jacob's research please contact her. As her credentials as a professional and a researcher most likely vastly exceed yours, she is not likely to be particularly interested in your opinion.
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Is it your contention that mass murders are mentally healthy and emotionally stable? If so, please "confirm your own claim." 
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"How about a diagnosis made by a professional?" Please use your Google-fu to resolve your inquiries, I assume you may possess the capability of such a simple task.
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Do you want to try again?