None of the "logic" behind your conclusions is spelled out.
I wrote: There is no legitimate civilian activity beyond recreational activities that requires weapons with the specific collected attributes of combat military small arms.
Reasoning: In civilian life there are no hunting or defense situations that require a light, easily handled low recoil semiautomatic weapon with large on-board ammunition capacity, both of those uses for guns are equally or better met by guns less focused on quick, accurate mass killing. What's left are recreation, entertainments, in short, hobbies - targets, combat arms competitions, collections, re-creation of modern combat dress and equipment. etc. Justifying unlimited access to M-16- like capabilities at mass killing to maintain a hobby is nearly pathological indifference to the harm such weapons can do when the hobby gets out of hand. Too bad you can't ask Mrs. Lanza whether she agrees.
I wrote: The lethal potential of such weapons in the hands of people who have access to them without having to pass through the military's filters of discipline, mental stability, a sense of responsibility and situation-determined use of such weapons limited only to armed combat or training for such combat, is and has been well demonstrated by the intended wanton murder of innocents.
Reasoning: The weapons and their imitators and clones are made to be lethal in combat situations where quick, accurate killing fire is available to engage with and eliminate multiple personnel. No one has to go through combat arms training and psychological assessment, which would filter out those not mentally equipped to handle that firepower to access them in the civilian world.
What is the source of your definition, besides making a definition that fits your forgone conclusion?
The source of my definition is an accurate analysis of what missions modern combat weapons were designed and built to perform, and one thoughtful, unemotional look at them points out the attributes they were built to have that meet that mission. There are obvious reasons why the arms of an infantry platoon aren't Model 94s or M-1s or Remington shotguns or M-1 carbines. Any effort to make M-16s and their clones and imitators disappear among hunting rifles and target rifles will fail even when done to an uninformed public. Those of us who have spent a lifetime with guns of all sorts ought to be able to see the differences (caliber is NOT among the differences) and clearly understand the mission the combat weapons were designed to meet that hunters and target shooters can't perform.
So almost every semiautomatic firearm known to man . . .
I have a number of semi auto rifles none of which meet all the parameters that M-16-configured rifles do. None of them, for example, have or need large capacity magazines to meet their intended uses including defense, only one has a pistol-grip stock but it fires .22 LR cartridges which aren't nearly as deadly as .223s are; if they were there would be no need for the increased power, bullet mass and thus the downrange energy of 5.56X45s or other light but lethal calibers.
So you'll at least concede there is some legitimate civilian activity beyond recreational activities that at least requires firearms, even if you disagree as to what is needed?
Absolutely. I carry a Ruger LC9, a S&W Model 36, a Walther PP in .32 or a Baretta 21A when I carry; I have a Rossi open-choked 12 Gauge double and a loaded .44 Magnum Ruger Super Blackhawk in the bedroom (no kids in there); I have a family heirloom Model 94 and a .30-'06 BSA barrelled action in a stock I carved from a Rienhart-Fagen blank for deer, a pre- '64 Model 70 in .300 H&H Magnum if I ever get the chance to go for elk or moose, a Model 12 trap gun for pheasant and other upland birds (ok, hunting is recreation but it also provides healthy "organic" meat and I won't shoot anything we can't eat); none of these are better met by a modern military combat weapon or a weapon copying all of its functions.
This sounds awfully close to "only the police and military should have guns."
Only if you're trying to hide modern combat weapons or their clones or imitators among all other guns. It ought to sound exactly like "Only police and military should have modern combat weapons or their clones or imitators".
Restricting or banning firearms will not change this reality and violates the 2A
Not all weapons, just those that in the wrong hands present a unique and greatly increased hazard to innocent civilians. Machine guns have been so designated, why is there no big push to get them legalized? Trying to scare gun owners into believing that ownership of all guns is at risk is no less ridiculous than claiming that no one ought to own any weapon.