I'll say all of those things, but to me killing and taking stuff is justifiable only in the context of overall good and evil. That is to say some things are just to dangerous and evil to let live, and have no intention of changing, and so in game that makes for a good justification for killing such creatures/beings and relieving them of their ill-gotten gain.
Otherwise I'll also say that personally, my theory is that the game, like most all role playing games, and many other types of games as well, really involve (on a deep level and sometimes sub-consciously) "player development" and not just character building. That is character development is an extrinsic exercise of employing yourself through the medium of a fictional character to a fictional world. Player development is an intrinsic exercise whereby one employs a fictional character in the background of a fictional world in such a way as to benefit through that experience to some real world advantage. So personally I would add to that list the following:
Player Development (skills, mental, personal, etc.)
Usefulness (utility) to the Player (though that might very well be considered little more than an extension of Player Development). But I can differentiate also. Player Development is what directly benefits the player personally (skills, capabilities), whereas usefulness may involve things like facts and data discovered, lessons learned, a broadening of experience, etc. So Player Development is player capability development and an internal factor, whereas Utility is external and is often knowledge or wisdom based, being both an accumulation of data, and the learning of better ways to employ what knows to any given situation (wisdom).
Social Interaction/Development and a Friendship/Comrade Exercise
Myth Exploration and New Myth Development
Psychological Development (used in both the modern and the old Greek senses)
Moral Development (and if properly played and employed maybe even spiritual development)
But personally I don't think it has to be Either/Or, or Just this/Just that.
It can be many things, sometimes simultaneously, sometimes sequentially.
Speaking of which I got church in the morning and I'm dog tired.
See ya.