Robbed of Potential: The Role of the Thief

Watching E.R. today, I saw them go behind the counter and steal a coffee from the microwave.  In the real world that's practically theft (yes, even if you're an FBI agent), but in games it's expected for us to peek around corners and kype stuff.
I remember going into every house in, say, Phantasy Star III, trying to find hidden chests and stuff under the bed.  We know that these places are laid out for us to explore, yet there's a tension, akin to the tension I talked about earlier between narrative and gameplay, between what we know generally as the system of law that most societies have that frowns upon taking stuff from other people, and the desire for us to fully explore the world that the designers have given us.

Dood, werez the loot
Dood, werez the loot
One way to address this disconnect  --between the narrative of the environment that tells us these things would be frowned upon by the people standing there, and the game that wants us to find stuff--  would be to create a game that tells the player their role is as a thief.  I don't just mean within the Garrett sense, although that can be awesome, I mean that the player is told at the beginning that their role in the game is to steal.  THEN, through the mechanism of player choice, we don't have to steal to advance in the game.  Say you're given access to a house.  You can go in, con the residents into giving you stuff, sneak around the house and take things, case the joint so at night you can burglarize it, steal their information through conversation so you can learn more about other places, or actually just solve their problems and leave them alone.  By being told that the player can steal, they are allowed to get away with it, but are also given the chance to go the straight and narrow and see if they can survive in this world.
I think a fantasy or science fiction setting might be preferred, because I imagine some media outsiders would treat it as a criminal's training guide otherwise (although I can think of a subversive criticism of juvenile delinquency with game mechanics like this).  What I'm talking about, though, is expanding the role of what it means to sneak around and steal.  You define what kind of thief you are, and get a range of options to do this in, rather than telling you this is what a thief does.

Specifically, RPGs

 How did this CeramKnife get in the party inventory?
 How did this CeramKnife get in the party inventory?
In an RPG context I've thought about this working, too.  Thieves in the RPGs I've played tend to be rather versatile.  They're treated as critical-hit attackers, infiltrators, trap disarmers, pickpockets, item experimenters and appraisers, compulsive shoplifters, and of course pickers of locks.  In various builds of the pen and paper dungeons and dragons this role was always expansive and fit into all sorts of interesting niches. Even the first edition had several skills that a thief could know, unlike all the other classes in the game (unless you count spells as skills.  I don't, in this case).  In the third edition this utility was recognized, allowing a thief character to pretty much have several different builds to choose from, benefiting from tons of skill options, many of which were unique to the thief.  Icewind Dale II has some good examples of this through its 3rd-E ruleset, and I think BG II did in its 2nd-E character kits.
Even with a team of all thieves, there would be plenty of wiggle room, especially if there was a flexible system that didn't prevent you from having all the fun equipment one might expect in a computer role-playing game.  You could have one who was good at infiltrating places, one that was good at running through town and finding a place to fence things, one that was an assassin-like backstabber, one who was the face of the group and who could con his or her way through high society.  Plenty of potential here for a focused game.
That's part of the issue, sometimes, with games that try to let the player do everything: they wind up letting the player do much that the game itself is hamstrung trying to make sure all the options are basically covered.  With a focus on a style, theft in this case, you manage to sidestep the general issue of trying to make all classes or roles equal.  You make a game where stealing and dungeon delving is the focus, you make these almost like minigames or strategical battles even when there's no overt bloodshed, so that every role is potentially appealing.  Full of potential, without needing to fulfill EVERY hero role we've accumulated in pop culture over however many years.  

Any thief-styled games come to mind that break genre molds?  Thief: The Dark Project, et al, are obvious examples of thief-focused games, but can you think of others?  How about different ways that thieves were treated in games that didn't necessarily focus on thieves?