...there isn't a substantial problem therewith. Not zero, of course, but by your line of reasoning cars should be outlawed immediately because of the actual accidental & unintentional harm rates therewith ... and the same issue with guns being orders of magnitude less.

The problem isn't accidental casualties (those are in fact quite rare). The problem is people willing to cause grave harm to others, a group which does not include a vast number of people who are not willing to cause grave harm to others save for stopping the former from doing so - but whom you are quick to lump together. Break down US murder rates, and you'll find the bulk of the problem firmly within certain subgroups; disarming other US subgroups (as you advocate) won't solve the problem, as up-arming those groups has decreased murder rates in their areas.