... what's there to interpret?
A militia(or military) is necessary for the security of the country, but the right of our nations citizens to own guns shall not be infringed upon. Pretty fucking easy to understand, they weren't writing all the crazy legalese we see now a days. Pretty straight forward to the point, not a whole lot to misinterpret unless you know you're looking for something that isn't there.
Well, for a start, the amendment doesn't say "but", that's your word and it changes the meaning entirely.
The way it is written if you want to add word, is 'because a militia is necessary for national defense, the right of the people to bear arms to meet that need will not be infringed'.
Now, there are all kinds of things to interpret. You say there's nothing, but the fact that four interpreted it differently than five says otherwise (and mixed voted in other rulings).
Does 'people' mean some subset of the people enough to meet the need of a militia? As you rush to say no it means every citizen, children are citizens, the insane are citizens.
It doesn't spell any details out. It doesn't spell out the definition of 'arms', either. Muskets used to be effective - now you need jets and tanks and, perhaps, nukes.
When have handguns been a primary weapon necessary for militias? Are US troops issues handguns even today, much less back then?
There's a lot to interpret - but the radical right on the court, at least, rarely seems to interpret, just to inflict their ideology, IMO.
Having said all that, the left on this issue similarly has many who base their 'interpretation' on what they want it to say more than what it says.