[seanmcdirmid]

The Swiss militia is setup to protect the country from foreign invaders. The 2nd amendment was setup exactly for this same reason, as the founding fathers were thinking about the British when they wrote it.

Of course, the text is vague enough that everyone will simply draw out whatever meaning they find reinforces their biases. Given that the most fervent upholders of the amendment today were draft dodgers back in the day, it is safe to say that protection of country is no longer important in their reading of the amendment.

At any rate, even if we accept that the clause is prefatory, that doesn’t make it meaningless, it has an effect on how gun rights should be maintained (so that the populace can overthrow the government or protect against foreign invaders, it is not protected for self defense, sport hunting, target practice, etc...).