Kelsier smiled. 'It means that you, Vin, are a very special person. You have a power that most high noblemen envy. It is a power that, had you been born an aristocrat, would have made you one of the most deadly and influential people in all of the final empire. ' Kelsier leaned forward again. 'But, you weren't born an aristocrat. You're not noble, Vin. You don't have to play by their rules--and that makes you even more powerful.
We are more prone to generalize the bad than the good. We assume that the bad is more potent and contagious.