We can go on and on about who should be allowed to have a gun, that the 2nd amendment needs to be fixed and the historical context of what the words mean.
What Stevens and others who support strict gun control are missing is a part of the Bill of Rights that is rarely discussed: the preamble.
"THE Conventions of a number of the States, having at the time of their adopting the Constitution, expressed a desire, in order to prevent misconstruction or abuse of its powers, that further declaratory and restrictive clauses should be added: And as extending the ground of public confidence in the Government, will be ensure the beneficent ends of its institution."
The Bill of Rights is not a list of rights granted to the people that requires, or is indeed subject, to endless interpretation. The preamble captures the contemporaneous debate issues - should the US Constitution attempt to list the rights of the people in a document that was designed to list the limited powers of the national government.
The compromise was a list of rights that were considered so fundamental that "...further declaratory and restrictive clauses should be added..." Those clauses were restrictions on the powers of the national government.
1st Amendment - "Congress shall make now law..."
2nd Amendment - "...shall not be infringed."
3rd Amendment - "No soldier shall..."
4th Amendment - "...shall not be violated..."
There are many who believe the Bill of Rights is a granting of rights to the people when it is actually a harsher, further restriction on the powers and authority of the federal government.
If one looks at the 18th amendment one sees that the prohibition on alcohol was not simply a prohibition but was a specific grant of power to the national government to regulate alcohol. It wouldn't have been enough to simply outlaw alcohol. The amendment had to grant an additional power to the government.
Stevens' amendment to the 2nd amendment would not prohibit the private ownership of firearms nor would it grant a power to the national government to regulate that ownership. Stevens' proposed amendment would simply reinforce the mistaken belief that the Bill of Rights grants rights to the people rather than restricting the power of government.
Much of the attitude regarding the role of the Bill of Rights can be traced to the 1930s when Congress and Roosevelt found a friendly Supreme Court willing to change the definition of commerce to allow the Commerce Clause to be used to regulate all manner of activities.
People are still willing to say, "The Constitution gives me that right," when, in fact, the Constitution give you no rights. The U.S. Constitution was designed to limit the power of the federal government so they couldn't infringe on the rights you have simply because you exist.