...want to accomplish things that improve the lives of people other than shareholders...
Have you looked into jobs in higher education?
The pay could be better, but it's not horrible. The benefits and working conditions are generally good. In my many years, I've never said 'wow, that's unethical'. Worst I've had is having to explain how certain policies, which sound good on the surface, are not equitable to all students in all social-economical situations and need to be revised.