Ha. So, I'm new to the game and series, just a disclaimer. I was playing around with the persuasion tools. I tried them on the same guy two or three times. By the end, he hated me so much that he attacked me! I ended up chasing him outside, where I . . . ya know . . . killed him. Now his body is just hanging out by one of the entrances to the city.
Anyway, I hope I didn't like destroy the universe by killing this character, or lose the opportunity for a cool quest. Can that happen?
LOL! Awesome!
Well, per what other have already said, you're good.
However, once you build your character up to the point of near untouchability, visit the Imperial City, and continue to kill guards until civilians start coming at you. Then, slowly march from city to city, unleashing your unbridled fury on those unfortunate to find themselves in your wake........
LOL, its sort of like, IDK, being Anakin Skywalker at the Jedi Temple. Eventually, you just hate everyone. And, its a great way to pick up arrows.