Past TES games has had a content rated M and its really 17+, Because of the blood and gore, you have to think about it from a psychological point, Humans killing Humans in the past has had severe Psychological problems for the Killer this is even stated in any biblical text Bible, Koran, etc..
Once when I was playing Oblivion, at Weye theres this old guy who asks you to find some scales he can sell so he can retire, and he tells you he already has some retirement money stored away at his house, so i pickpocketed the key to his chest from him, and took the money. Afterwards, I felt guilty, since its HIS money for retirement and he cant work yet.
I dont know whats was the point of saying all that..