Stephen King wrote and published a novel about a teenage boy who killed his teacher and held his classmates hostage. The Novel, "Rage", was cited as inspirationby perpertrators for a number of mass shootings in the 1980's and 1990's.
The shootings prompted King to withdraw the book from the market. He had every right to exercise his first amendment rights, but did the responsible thing.
Which brings up an important aspect of our civil liberties and citizens’ responsibilities. There is no requirement that a citizen ‘justify’ the exercising of a Constitutional right, there is no prerequisite that the exercising of a right will somehow ‘benefit’ society in general, even when the exercising of that right seems inane or pointless to other citizens.
This obviously goes to the issue of gun control, where those who exercise their Second Amendment rights are often asked ‘why do you need an “assault weapon”’? As with the exercising of any other right, a citizen is not required to explain his ‘need’ to own a given firearm otherwise legal to posses in his jurisdiction. Citizens often say and do things in the context of their civil liberties that others find strange or even offensive, but that is not justification to curtail or preempt the exercising of that right.
That society may perceive a potential danger with regard to citizens owning a certain firearm does not justify banning that weapon, whether he ‘needs’ that weapon or not.