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Drugs or mental illness, one of the two.
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Why not both? It is not an unusual combination, and it is also an unfortunate fact that there are a lot of mentally ill people on the street who refuse treatment. Let's keep our viewpoint broad unless and until we get more information.
What's sad is that the crazier the act, the easier the court case.
The day someone rules that someone is not responsible for their actions due to their mental state and orders them to see if they can fly off a cliff is the day the gene pool will become just a little deeper.