You make the error in assuming that a sociopathic state of mind persists indefinitely.
I'll give you an example: I'd recently lost my father (two years after my mother), and was dealing with my girlfriend (at the time) who was quite blatantly fooling around with another guy.
I was plagued by suicidal thoughts, and not at all mentally or emotionally stable. While I would like to think I never would have utilized a firearm in a foolish manner if I had had one readily available (as coincidence would have it - a few months earlier, we were one home among many victimized by a rash of holiday thefts - to include my father's firearms... it's that kind of stuff that makes me consider the possibility of an 'active' deity... though why such an active deity would choose to act in that particular way rather than fixing other problems is a question that eludes me). However, looking back - I would not have trusted myself to freely have one outside of a controlled environment.
Would I have gone on a shooting rampage? Probably not. I'm too prone to brooding for random acts of violence. But the same does not apply to others.
So... you're presented with a problem. A year before that whole fiasco - I would have been perfectly fine and competent as well as within the legal age to own any firearm on the market. Today, the same applies. I'm doing pretty good, financially secure, much more experienced in handling stress, etc.
But that one time of weakness....
Further, the diagnosing of psychological pathologies is a sketchy art. The borderline between "normal" and "pathological" is a hell of a lot thinner than we really want it to be. In other cases - it's impossible to tell what someone may do. Individuals with certain classes of autism can display no violence - no malice - and then suddenly kill people because it's a new phenomena to study. Nearly all autism-spectrum afflictions come with a difficulty in connecting in an empathetic manner with others - a component which can go from 'socially awkward' to 'cold and unfeeling' depending upon the situation.
I would probably be classed as having or Asperger's, as I reflect a number of the different characteristics (though detrimental traits are not nearly as pronounced as in others). Some of the people with more extreme cases should probably not be given a firearm (some would have no interest in a firearm... or if they did, they might have an interest in collecting firearms but no interest in actually shooting). But how do you determine who really is and is not a high risk case?
You're talking about in-depth psychological analysis programs that can easily take months of weekly observations to even detect some of these things. Are you going to tack that onto the background check for a firearm and expect the person purchasing the thing to front the cost?
... I'm sure the lobbyists for unions of mental health clinics would be thrilled at such a prospect... but let's return to reality.
You already illustrated another pretty big problem in your whole idea. So you determine that I'm not a high risk for flipping out and dressing up as the joker for a trip to the movies. What about my room mate? Kids I have in the future?
Sure - I, personally, will be taking measures to ensure that my weapons are properly secured so that I'm not having to explain why a weapon registered to my name was used to kill 50 people. But that's me; and just because I have the thing secured does not mean they cannot defeat the security.
So... if your response to me saying: "why do you stand on the high ground and tell me that I should subject to increasingly oppressive laws because of the decisions of a few idiots among us" is "shit happens"....
Why can you not accept that "shit happens" and the idiots will always ruin your plans for a perfect society in the end? Why punish people who don't cause problems?
It's desperate to compare a 1.5 ton mass of metal and composites powered by an engine that can pump more energy into that mass in 2 seconds than is possessed in a hand grenade ... to a firearm that packs less overall kinetic energy than a standard punch?
We trust people with these masses of machinery day-in, day-out. We think nothing of it when a 16 year old gets into a vehicle and merges onto the highway with a crowd of 30 people clustered 400 feet away. We even allow ourselves to rev our engines, slam on our brakes, or spin our tires as a show of frustration and aggression (aside from flashing certain symbols and sentiments through the window).
We also talk on the phone, check text messages, and eat food while driving a machine that can end the life of a family in a fraction of a second.
Over-reacting, you say? Happens all the time. Talk to a highway patrol officer how many kids they've cleaned out of wrecked hulks due to someone who was busy fapping to a text or searching through the classifieds.
It's interesting that there are
more firearms in America than registered motor vehicles in operation on the roads:
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"According to the US Bureau of Transportation Statistics for 2009 there are 254,212,610 registered passenger vehicles. Of these, 193,979,654 were classified as "Light duty vehicle, short wheel base, while another 40,488,025 were listed as "Light duty vehicle, long wheel base." Yet another 8,356,097 were classified as vehicles with 2 axles and 6 tires and 2,617,118 were classified as "Truck, combination." There were approximately 7,929,724 motorcycles in the US in 2009. [5]"
"U.S. citizens own 270 million of the world's 875 million known firearms, according to the Small Arms Survey 2007 by the Geneva-based Graduate Institute of International Studies."
.... Yet these "transportation devices" kill far more people than the "killing devices" ....
You deny that the intended function of an object has little baring on its capacity.
And cars STILL kill more people than firearms.
Quite obviously, you all can't handle the responsibility of operating a car.