Just ban radical atheism!!!
What law guards the public against sudden emotional or mental derangement? Whatever form that law may take, it would have little or nothing to do with side arms, but a LOT to do with civil liberties.
Which of the civil liberties do you want to take away? Privacy? Quiet enjoyment of property? Speech? Religion? The right to freely meet in the public square? How about just about everything in the Bill of Rights? Has that now become “the Bill of Frights”?