Presidents haven’t always needed Congressional approval to involve the US in war, and have found creative ways to get around the Constitution.
Enemies help unify people and serve to justify often severe and unconditional reactions; the best enemies are the most ruthless, or at least those portrayed as such. From England’s King George III to Osama bin Laden, throughout American history, enemies have brought the nation together.
Historically, treason was one of the most grievous sins. In Ancient Rome traitors were thrown onto the Tarpeian rock from the Capitoline Hill. In Dante’s Inferno, Brutus and Judas Iscariot occupied the lowest tier of torment.