Despite the overwhelming number of "yes" votes, I'm still against evil characters.
My reason is still that true evil is very different from greed or violence or wanton destruction. Evil is not the lack of good deeds, or even someone doing something bad like mugging or murdering. It is the antithesis of good. To have players "aligned with evil" in the game would mean that they must be actively seeking the destruction of the world, since everyone else is seeking to redeem or at least stabilize it. Or they would be working against law and order (not just breaking laws, but trying to collapse society). I'm all for murder and violence and theft and bullying, but I really don't see the need for a faction of players out there trying to bring down the carefully constructed society that Simu has put so much time into making.
Even the most heroic of characters occasionally steal and or murder, bully, mug, or otherwise break codes of morality. So to play an evil character, one must go far beyond such acts.
They simply would not fit in with the structure of the game and would ruin much of the flavor.