Fair enough, the only thing i really care about is that solving problems through conversation should give the same or at the very least similar amounts of exp. Whether or not killing them afterwards gives exp doesn't interest me at all because that's not the way I play in almost every case. (the exception being if I am talking the people down so a hostage can escape and then I deliver justice to the villains :D)
Which has constantly been my point:
If the game is balanced around the level you should be at given the xp through conversation, and the end difference between you and someone killing everyone is maybe two-three levels (ie that's at max, in game one the difference is one or two depending on optional stuff), why do you care about the other guy?
The game is balanced around your method so it's not like your gimped. The other guy is literally doing more work and has to meta game, thus requiring an extensive guide or multiple play through, and the end difference isn't even that notable. There's also the whole reputation/karma thing to consider and the fact that evil = wants power traditional understanding.
Do you see why I call this whole thread silly?
The most in willing to concede is that killing shouldn't be that easy of a decision for non combat NPCs.
More thought should go into it then: MOAR POWAH!
Even yourself, the only reason you seem to show concern is "fairness" because it's not your playstyle so you wouldn't be effected if such a playstyle was gimped.
This whole idea that things are currently "unfair" is what I find truly silly
Edit:
And yes, stabbing stab to the face any who would hide behind another. Blood for the BLOOD GOD! SKULLS FOR THE SKULL THRONE!