From Lyle Deniston in SCOTUS blog:

The final briefs seeking to shape the Supreme Court’s coming decision on the reach of the Second Amendment’s protection of gun rights suggested Friday that states might be free to violate other parts of the Bill of Rights, if too narrow a view is taken of the constitutional liberties that state and local governments must respect. If gun rights are singled out as the only constitutional rights unshielded from states, counties, and cities, then no other rights are safe, according to the new briefs.

Like or loathe guns (and I do not do guns myself), I think the pro-gun briefs are right. The biggest mistake about Constitutional questions is a tendency of all sides to believe that all the document really says is: "Do good things. Do not do bad things."