>>>> Then who decides what "given aid or comfort to the enemies thereof" means
That is tough. We could really use this to our benefit, but now is not a good time (wait until after reelection).
Broadly speaking, an example ... Sean Hannity supports the troops, and the vast majority of the troops respect and honor Hannity in return. The troops become demoralized when Hannity, who outspokenly supports their mission, is criticized. When our troops are demoralized, their terrorist enemies are correspondingly strengthened, i.e., given aid. Giving aid to the enemy is treason, which may be punishable by death.
Do I believe that anyone who criticizes Hannity should be put to death? No necessarily. But do I believe we are letting a broad and potentially very useful tool in our constitution and laws sit needlessly idle? Heck yes.