Is it okay to be something mundane like an accountant or csr at an employer that is the modern equivalent of a corporate deathstar?

At what point are you responsible for the bad stuff the organization does to make another buck (that you definitely won't see anyway), regardless of what they do to people and society? How much effort do people need to make to ensure their labor isn't going toward an enterprise that knowingly does evil in the world so a few rich selfish narcissists can get more richer? Where are the lines?