Of course the shop owner is nervous. He might have committed a death penalty crime.

[Silent3]

21. You have to take into account the Constitution is shorter than many click-thru software licenses

You don't have to be a "textualist" or an "originalist" to accept that the Constitution doesn't make a lot of sense unless you take into account some of the understood context and history of jurisprudence that it was meant to stand upon.

While it might seem awfully strict to limit "enemy" to mean a country with which there is a declared state of war, the Constitution certainly doesn't go the other way and declare the term broadly, and it does make clear the process for declaring war, so that's the best (and safest) means to understand the term "enemy" in a Constitutional way.

Now, when it comes to supporting some of these domestic terrorists (AKA "militia groups" ), it could well be said that some are trying to "make war" upon our country, even if they aren't a declared enemy, and that those groups can reasonably be called treasonous for doing so.