In short, the only real way to reduce gun violence and crime, is to embrace gun ownership more than we do.
I really hope you never become a doctor, because if a patient gets rolled into the ER with an open gash, I only see you prescribing bandages and telling them to get out.
Except, what you don't realize is that open wound was probably infected by something before the patient got into the ER. Instead of going in and sanitizing the wound and prescribing medicine to keep the infection down, you just stopped the bleeding and assumed that solved the problem. That patient is going to suffer now from whatever is in his wound.
Same with gun violence in the US. The country obviously suffers from violent crime (the aforementioned open gash), and you did put a cap on crime temporarily with allowing people to carry guns (or bandages), but the country is just going to die from the inside from escalation and even higher levels of crime (the infection).
So instead of just assuming guns are the panacea for the crime problem in the United States, something has to be done to treat the problem at its source. Improving the education system to keep kids in school and get them on to well-paying jobs after getting a degree keeps gang violence low. Decriminalizing drugs and not enforcing morality on the country eliminates the illegal drug trade and turns it instead into a legitimate enterprise with no need for exposing innocent people to criminal activities. Providing assistance for the poor and underdeveloped areas in the country raises people out of the need to resort to violence, as will reducing or eliminating the costs of healthcare.
Unfortunately, the people in the US that are very pro-bandage are typically very anti-medicine.
The Second Amendment provided for a means of the people to revolt against the government should its corruption become unbearable. They had a right to fear it too, with their experiences under the British. Yet, Thomas Jefferson, the archetypal anti-Federalist who demanded a Bill of Rights, saw the US electoral process as the exact revolution the country needed, not a bloodbath.
Unfortunately, most of the same people who are very pro-gun for the sake that it protects the country against tyranny, are the same people who reelected Bush and most Republicans in 2004. You know, the architects of the Patriot Act, the Military Commissions Act, the ones who wiretapped and spied on Americans, the ones who actually ran the aforementioned corrupt government? Where was the armed revolution then? Guns do nothing to protect a people from tyranny when the gunowners themselves are too blind to see tyranny right on their doorstep.
So, in truth, one purpose of the Second Amendment was outdated just a little over ten years after its ratification.
Let's move onto the second purpose. Warlock claimed that the armed American populace deterred a Japanese invasion of the US mainland. Comparing the US populace fighting off an army armed with 1920, 1930, or 1940s weaponry and technology to the US populace armed with shotguns, hunting rifles, and pistols fighting off an army armed with modern weaponry is unimaginable. It's not the same thing by a long shot. At that, American citizens don't have access to the same types of arms that reasonably effective insurgencies around the world have access to in large numbers--RPGs, assault rifles--to be an effective insurgency themselves.
So, summed up: most world militaries are far better armed than the average American citizen who has a gun. Second Amendment will protect Americans against invasion? No. That might have been true two hundred or even seventy years ago, but not anymore. The militias the Second Amendment provided for have been absorbed into the National Guard and the US military.
So, there you go: all three major purposes of owning guns in the US (besides for sport) are ineffective, outdated, and/or useless. Most of the rest of the developed world has realized this, why can't we?
@Scotty: I don't care if it matters to you or not. Isn't the gun talk getting boring to you yet? Also, since you are Christian, I would think that you would try to do whatever you could to avoid killing, but your talk and actions seem to contradict Christian nature and the peaceful nature it talks about.
One word for you: Crusades
Word of advice: the Roman Catholic Church of the Middle Ages was one of the most corrupt and unchristian organizations the world has ever known. Also, the Crusades had little other purpose than to stop the members of their own religion from squabbling with and killing each other and to instead focus their rage on killing the infidels.
Replace "Crusades" with "jihad" there and I think it'll start sounding familiar...