Automobiles, prescription drugs, knives, where do you draw the line? People die everyday using everything I listed because people are irresponsible.
But the difference is that automobiles, prescription drugs, and knives weren't necessarily designed as a tool to kill (hunting, personal protection, war, etc.). Let's not lie to ourselves and pretend firearms aren't what they really are, tools to kill. Not saying that is there only legitimate use now. Nor am I saying that is justification for banning them or regulating what can be owned. My point is that people should be required to have more training to own them.
Take automobiles for example, there are no requirements for ownership of an automobile, but when it comes to operating one there is extensive training that is involved (weeks worth of classes and hours of practice, mostly under supervision). And the point of this process? Because society has realized that operating a motor vehicle can be a very dangerous activity if the person is not properly trained.
And a side note, prescription drugs are HIGHLY regulated. In fact, you must get permission from a doctor to LEGALLY use them. So should we just make all prescription narcotics over-the-counter so anybody can buy them?
Why not require just a little more training for people who want to own firearms? Would that really be a detriment to society? Whatever your definition of "regulated" is with regards to the second amendment, people should have knowledge of what they are using and how they are using it.