Regulating human nature assumes some people are capable of evil, others are not. In fact it is a choice and our internal values are where the real risk lies. Face it, we all have weapons built into our bodies (teeth, claws) and our minds can be used to elaborately plan actions with unforeseen consequences.
Our real protection lies in the social contract, not regulating the spread of blueprints. Every citizen has access to sharp knives but that does not mean that we use them. Box cutters became weapons not because we failed to detect them, but because of a philosophy that does not enshrine value to others. It is the spread of radicalism and the rule of totalitarianism we have failed to defeat.
When we are taught values by an authority that uses its power in a corrupt way, whether it be religious or political, therein lies the source of insanity.
Guns in the hands of citizens do not protect them from guns. Money in the bank does not protect one from madness.