This argument boils down to "What I'm doing is evil, but someone else would do it if I refused, so I might as well get paid for it." It's basically the Nurember

This argument boils down to "What I'm doing is evil, but someone else would do it if I refused, so I might as well get paid for it." It's basically the Nuremberg Defense, but without even the threat of punishment, only desire for profit. To answer your question: the police officer may not be evil, but she's certainly doing evil. It may be possible to make a coherent argument that the harm done is outweighed by the good the cop can do in her community if she toes the line and keeps her job. I don't think you can make that argument when the harm is "willingly abetting an oppressive government on a massive scale" and the benefit is "we make a whole bunch of money."