The banality of evil is a well-known idea. That evil is often done by people who are just doing their jobs and see themselves as decent people.

Words are cheap, thoughts are cheap, and voting is cheap. A full-time job, on the other hand, is a substantial contribution towards something, and it comes with a huge opportunity cost. The job you have is a major factor in determining your moral character. Determining what kind of a person you actually are, as opposed to the kind of a person you believe to be, or wish you'd be.