This is a very interesting question. Perhaps we will one day understand better what genetic configuration predispose someone to be a violent and/ or ruthless individual. Then, these individuals would have limited to no access to the types of resources that allow the production of arms. But what about the normal person? Couldn't the average person be capable of earth-shattering mayhem? What then? Treating how people use things for malice seems to be treating a symptom rather than the disorder. We ought to encourage rational and beneficial belief systems and discourage harmful ones, that is those that should be discarded. Suppose there is resistance. How does one fight a war of beliefs and emerge the victor? Won't we always leave a residue until everyone decides for themselves to discard their beliefs on their own? Such governing must not resort to compulsion, but instead, to guidance and leading the world societies by example. What do you think?