"Almost every", but most of the ones that do that think the guy is in the wrong think it is being done on purpose to disrupt the game. I won't name individual posts, but at least 4 on the first page, and one recently just prior to my last post seem to suggest the player is doing it on purpose for the purpose of disrupting the game or just not playing along.
Again, this may be true, but it is sad to see people first think that way; then later suggest communication. My own first post here included starting with negative assertions about the game.
*shrug* This guy sets off my "Does Not Play Well With Others" alarms. He was given pretty clear guidelines - "willing to jump in and help a stranger in trouble" - and made a character whose explicit impulse was to do
exactly the opposite; when he sees strangers in trouble, he doesn't help them, he takes their stuff.
My experience has been that this sort of thing is usually the sign of a player who... well, put it this way: Such a player behaves in ways indistinguishable from someone being disruptive on purpose. Whether he actually is being disruptive on purpose is beside the point. As far as his DM and fellow players are concerned, he might as well be.
(I find that most such players have plenty of excuses - usually about how they're "just playing their characters." And in their minds, I think this actually does justify their behavior. But somehow their characters are always disruptive jerks perfectly suited to wreck whatever campaign is underway.)
That said, I agree with the general sentiment that the DM should talk to the player first. He might just have not read the guidelines, or he might have spaced out the bit where the character is supposed to be an altruist, or he might have some idea that he's going to take his character through a journey of personal growth from amoral thug to genuine hero. It's possible - unlikely, but possible - that he'll turn out to be a good player after all.
But given that it's a PbP game and you don't have an existing friendship to maintain here, and given that there are probably any number of other players ready to join, I see no reason to cut the guy any slack beyond that. Give him one chance to shape up, and if he doesn't do so instantly, out he goes.