It is entirely possible that they were reversed, and that Demandred was a benevolent and altruistic individual while Lew Therin was ambitious and power-hungry, but his subsequent behavior and self-serving agenda argue the opposite, as do Lews Therin's actions suggest otherwise about HIS character. Certainly he would have been welcomed with open arms had he attempted to leave the sinking ship that was the cause of the Light, and yet he forewent those opportunities. The Forsaken recall that "there had been attempts to turn" him to the Shadow so it is not as if he was insensible of his opportunity, etiher. While it does not prove anything about their earlier character, their subsequent behavior of which we do have knowledge argues for the worse interpretation for Demandred and the better of Lews Therin. Being a politician is not by any stretch of the imagination an inherently good thing. We only think well of LTT because of his demonstrated heroism. Given the self-serving aspects of a political profession and the obvious rewards and gratifications, and Demandred's evident desire for ever more of those rewards and gratifications, the possibility that he was a good and virtuous individual cannot be taken seriously. There is no evidence of any such character in his history, and offering the existence his political career as evidence for any goodness on his part is a ludicrous ploy leaving you no room to talk about nonsensical arguments.