I would love to learn if people have structured approaches for identifying companies that are in that "least bad" band, but yeah, I agree that as long as we have a system based on extreme wealth inequality, it's going to be pretty difficult to find moral work. At the end of the day most of us are working to make billionaires richer--in the best case we do that by genuinely creating value, but frequently it's about taking money away from some middle or lower class person (however indirectly).

One way to decide is whether the company has a dedicated Wikipedia page with criticism, or, for the next level, a section.

Imagine yourself describing to your relatives how the company has made money and see how embarrassed you feel.