James Holmes was a "law-abiding citizen" when he amassed his arsenal

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81. The Bill of Rights...

...is foundational to our society and government. The context of the BoR is its relationship to the Constitution. Such an enumeration of protected rights was required by some of the states and those Founders, who were representatives, for the stronger federal government to be accepted.

The 10A states: "The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people." Aside from the 2A giving ONE reason for the protection of the RKBA, the 10A specifically prohibits such federal bans. The 2A is not meant to be an entire justification for or explanation of the scope of the RKBA.

In a number countries there exists as law the principle of legislative supremacy. We don't have that in the US as legislatures may pass laws and the courts may find them unconstitutional or lacking in some other way. Any such universal ban would never make it as law.

Sudafed; really, I can probably get Sudafed from my daughter if make her a sandwich.

Why are we discussing buying a firearm online? Holmes didn't buy any guns online. Besides you can buy from a licensed FFL dealer anywhere but you need to pass the NICS check at a local FFL where your purchase can be shipped and where you can take possession.

An examination of the ninth paragraph of Federalist Paper #46 written by James Madison, highlights the common perception that the 'militia' was intended to be everyone.

It is also clear to me that the most dangerous or most powerful weapon around is not a Glock or an AR-15. The weapon of most concern is the human mind. The human mind can adapt to overcome incredible challenges. More powerful than a gun is diesel fuel and fertilizer. Tim McViegh proved that. More powerful yet is a Boeing 767 or 757.

A true effort at making acceptable the treatment of emotional and mental illness and supporting the sufferers rather than alienating them is part of the answer.

Colorado participates in the NICS as a 'Point of Contact' state. They have made the effort to establish an office in the state which dealers contact to run the background check. In many states similar offices also have access to data that has not yet or can't be added to the database maintained by the FBI. That data may also be used as a reason to deny the purchase.