The Second Amendment basically says that the government is not entitled to a monopoly of arms. It didn't mention anything about a federal or state militia because a militia is a body of citizens organized for military service, not a body of police, soldiers or government conscripts. Albeit we don't have many organized militias, the public could organize as the need arises.
The Second Amendment basically says that the government is not entitled to a monopoly of arms. I am endowed, by the Creator, of certain, unalienable rights, as are you.
The bill of rights, and in this case the 2A, simply re-affirms those aformentioned, pre-existing, rights.
Further, I would hold these rights to be self evident, and exercised so, regardless of what tyrannical government espouses.
Further still, I would hold these rights to be self evident even if they would argue against a creator.