Go out into the world and do well,
Go out into the world and do good.
― Minor Myers
Good and Evil aren't exclusive, but it doesn't mean you shouldn't discriminate between jobs, even if just a little. All the money in the world wouldn't console you on your deathbed, but knowing your family will get off well because of what you gave them helps.
I say do your best first, but make sure the people you're working for are doing their best too.
EDIT: I don't understand markup