[homosaur]

In general, the point of something like castle doctrine is to maintain defense of life, not property. If I went down to the edge of my property and someone came onto my property and was not threatening me you can't then shoot them. The argument for castle doctrine is you can consider the act of home invasion itself to represent deadly force and can respond freely.

Castle doctrine is a states-only policy and the feds have no position on it. The second amendment states only that people's right to bear arms shall not be infringed, it doesn't state anything about the application of force.

I don't want to get into this debate on HN but there's not that much evidence that the 2nd Amendment was meant to be a check on the army. It's related to the long-standing English principle of the right to self-defense and the English Bill of Rights of 1689. The English always thought you had the right to defend yourself with deadly force and a long standing tradition of a natural right to bear arms. https://en.wikipedia.org/wiki/Right_to_keep_and_bear_arms