We'll have to agree to disagree on this one. Going by that logic, one could make the argument that the founders could not have imagined automatic weapons and therefore we should not be able to bear them. I'm going to stick with the Clarence Thomas absolutionist view of rights.
The founders had no concept of how a whole nations wealth can be tied to a couple of buildings in New York City...or how those building could be the target of enemies from the other side of the world...or that our enemies could strike at us in a matter of hours by flying tremendous flying machines into buildings taller then many eastern mountains.
No, you folks simply don't seem to grasp the fact that the world is a very different place today but fixate on single issues.