moon knight
Matt7895's alt
You have a point there. There are benefits to letting you kill everyone though, and they are again roleplaying-related. If you kill a person it's because you chose to do it.
Of course, but that choice has to have a consequence for the character that is accounted in the quests and in the dialogues, which also requires to have a more loose main quest. Cause otherwise it's like in Grand Theft Auto, I can kill the entire city and make me chase by the army for the entire map but then the plot advance like nothing happened because it's not design to account for the free roaming bullshittery.
And that is in itself a restriction, because if I already know that killing everyone is not gonna have consequences, I'm not gonna play as a psycho because it's meaningless.