"What the amendment says is plain enough."

Nonsense! That is the point. It is NOT plain, or the debate about what to do about it would be clearer....maybe not easy to reach a consensus, but if there were 2 or 3 sentences instead of one, defining 'militia' and which 'people', we could amend the amendment easier.

As to: "Stating a rationale for a thing does not imply that there are no other rationales."

Right...like I said above. Certain people, trained and registered, living in certain places, owning a few carefully defined categories of guns and limited to defined types of ammo...etc.

It's not difficult to explain....it's just that there are many, many who flatly don't WANT any controls that might interfere with their 'hobby' and obsession...no matter how much sense it makes to have more controls.