Normally I agree with most of what you post, but I see the above statement (and similar statements that get "trotted out" whenever this topic comes up) as a "straw-man" argument that isn't really relevant to the discussion.
There is a huge difference between brass-knuckles, nunchaku, machetes (or for that matter, a full auto AK) and a "suitcase nuke" or a Stinger missile. I don't see anyone saying people should be able to own WDMs, but I see no reason people should not be able to own any common personal weapon (martial-arts weapons, or any knife, impact device, or firearm).
It's the way it's used that is the problem, not the weapon itself.