What Causes Someone to Act on Violent Impulses and Commit Murder?

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6. Obviously both

In the Sapir–Whorf hypothesis it is postulated that one's command of language (or lack thereof) has an effect on his perception of the world around him. The very information of the signs of madness and detachment from reality have become both more accepted and less familiar to us all. Is Hamlet still a mandatory study in this age revisions in teaching theory? In his vacillation over revenge, six others are die.

If we accept that the actions of others in the world around us can influence our own levels of aggression, hostility and violence, can we justify a 'self-control test' to determine things about an individual's psychological make up that are predictive of aspects of an innate killer instinct, self-harm and social normality?

If we answer yes for those seeking to acquire weapons, shouldn't we answer yes for everyone? We have far more suicides than murders and since all deaths are a loss, should everyone be examined for these problems and deficiencies?