Back in the early days, civilians could, and did, own cannon. According to the Miller decision, which control freaks seem to adore, it's precisely those "assault weapons" that are protected, because of their military utility. Part of the governments argument was that the Second Amendment protects only the ownership of military-type weapons appropriate for use in an organized militia.That's for civilian arms, but in all seriousness assault weapons are outside that realm. Do you think every citizen was aloud the heavy arms of the day, back in the amendments era? Did everyone have access to ship to ship cannons? When the danger of the arms outweighs any idea of some kind of oppressive government, something needs to change.
Why don't some of those countries with gun control, have the government beating down their doors if this is a legit issue? They have far less murder as well.
European countries with gun control had far less murder before they had any gun control. OTOH, in the Western Hemisphere, most countries have much stricter gun control than we do, and a lot more murder. We have one of the lowest homicide rates in this hemisphere, with the least amount of gun control.