To my mind, there’s an inconsistency in this argumentation – on the one hand, you want guns to be seen as ordinary tools, on the other, you refer to their special status as given by the 2nd amendment. That doesn’t seem to go well together – if guns really were mere tools, why would they need constitutional protection?
The fact of the matter is, a gun does increase your lethality. Carrying it effectively means that you’re mere seconds away from potentially killing or grievously wounding anybody in your line of sight. Now, I certainly believe that people can handle this responsibility towards their fellow citizens, and I trust on this every time I get into my car (though to have it considered a right, rather than a responsibility only to be accepted with the greatest reluctance if it is thrusted upon you by necessity of circumstance, to my European thinking, seems somewhat strange). Everybody accepts certain caveats when wanting to command a vehicle capable of dangerously high speeds, such as having to possess a valid licence, and registering said vehicle, yet one can hardly even make similar suggestions when it comes to handguns – which are, arguably, of an even higher danger-to-utility ratio, at least for the majority of people (besides, intentionally shooting someone doesn’t open the shooter up to the same immediate danger an intentionally caused car accident would).
Also, the whole ‘if you criminalize guns, only criminals will have guns’-argumentation is very valid, taken as such – certainly, that guns are illegal won’t prohibit anybody that already has illegal intent on their mind from acquiring them. The same argument, however, can be made for drugs – if drugs are illegal, only criminals will get high. It also works for murder – if you criminalize murder, only criminals will kill people. It’s thus not an argument against gun control laws at all; it’s an argument against all law.
There is, of course, the issue of personal protection the above argument somewhat glosses over – drug use doesn’t generally constitute a thread to anybody who could then defend themselves with drugs in turn; and you’re explicitly allowed to kill people in the face of serious danger to life or health. Personally, I see no reason to arm myself because of perceived threats, both because I’m not sure about a handgun’s effectiveness towards that end, and because I don’t judge the danger I’m in big enough; but I admit that one can validly feel different about this, and if I were living in a neighbourhood where I’d have to be weary of standing on the window too long for fear of catching a stray bullet, I very likely might. Similarly, I see no reason why guns shouldn’t be used for sport (though I suspect there may be ways to shoot for sport in a way nearly identical to the way it’s now without guns that actually could harm anybody).
Thus, flat-out outlawing guns may not be the way to go, besides being probably near impossible to implement in America; but I can’t really see any arguments against restricting their availability, possibly by requiring license and registration, and even excluding certain types of weapons/ammunition from general availability (though it may well be the case that the ‘assault weapons ban’, as presently conceived, is ill-advised – I’ve read numerous persuasive arguments towards that end on this board).
So, uh, that’s kinda my take on the arguments that are actually more or less already present in the OP, take it as just illustrating the whole thing a little from my point of view, and besides I’ve spent too much time typing this up by now to scrap it.