No, it's the same problem: two sides of the same coin. When a player plays in a way that maximizes his own fun at the expense of others at the table, that's a social issue, a problem between the group and the player-- not an illusory 'role v roll' problem.
/threadjack
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I'll explain why IMO it is a different problem.
Optimizers are not necessarily "dickish" players. The are easily ppl who, for one reason or another, have learned to play the game a certain way.
Many of the optimizers have never actually played in a ROLE-playing game.
Many see the game as an inside competition, with the sole purpose being to prove who is best. Actually, this kind of reminds me, how as a kid i used to fight with other kids on who's the strongest... Arnold... or Stalone..?
The've learned to play as Player vs Player and Players vs DM...
So when they find themselves among role-players, they play like they are used to, and that means they try to be the best. They see it as nothing more as a game of cards, or as monopoly if you may...
Now players like the one you described (the dickish rogue who steals from the party), are not necessarily players who do not know how to roleplay. These are players who cannot put aside their ego no matter what. In some cases they are even good roleplayers! Not that this very fact makes them any less dickish, but at least their do not necessarily derive from a certain "cult" that plays the game a certain way. Those are dickish players plain and simple.
So when i am addressing the problem of optimizers. I am kind of talking about a whole new breed of players here.
Is it the fault of Books? ...the plethora of rules? ...the direction the game has taken by the industry itself? ...MMORPGs? perhaps some or all combined together...
Not that players of the like did not exist with previous editions.. sure. But i have a feeling their numbers are much bigger than they used to nowadays...