Aragorn killing the Mouth of Sauron
This is from the Extended edition of the Return of the King, and if you're here I assume you've watched that. Aragorn straight up murders an ambassador because he doesn't like his jive. This bothers me enormously - Sauron is certainly not negotiating in good faith, but Aragorn should still follow the rules. Because that's what Aragorn does.
Is anyone else bothered by this? It's not the worst sin of the movies, but it irks me.