The big part of your not small message is about justice - this will be soon introduced as justice system - so starting from unpunished pillaging boxes to other vices all will be stopped.
Regarding killing NPC - it is MMO and would probably make too much issues for other players.
Many options do not work in MMO as they do in single player. You can compare - we will not stop you, but simply they do not work the same. You can not forget about balance and performance and that one player should not stop progress of others - many many points that the goal of making good MMO makes implementing not inadvisable.