I work for one of the big companies that you would think (from the vocal minority) everyone hates. Only one of their business units is "not well liked", another is ambivalent, and another creates health care products for students and doctors. They try hard to provide opportunities for minority groups in the company, they organize charity events for local groups doing things like fighting hunger or childhood cancer, and they try hard to be one of the best employers wherever they have offices. Their leadership promote the idea of always trying to do the right thing and have an open door policy, and have changed company decisions because of concerns gathered via petition. I'm very frustrated at the poor organization and execution of this company, but it does genuinely try to live good values, and all the people I've ever talked to here (including leadership) genuinely care about other people. And I know for a fact that their products have pushed forward advances in science, technology, medicine, even giving away product for people fighting the pandemic.
I have the feeling that all large companies, regardless of how ethical their mission, can make you feel bad. But just because you feel bad doesn't mean the majority of outcomes of the company are bad. I mean, shit, our country as a whole produces some pretty bad outcomes, but not necessarily the majority. At some point we need to be more rational than emotional and do as much good as we can while still collecting a paycheck. But of course we should be willing to leave and work for good if we can no longer justify the bad.
I don't think there is any safe math for that. What if staying provides a better opportunity to create necessary change? At what point do we choose between the easy and the right, and how do we even find that line?