That's why I said "aspects of". If I fully disagreed with a project and thought it was evil, I wouldn't work on it.
However, that's not normally the case. There may be aspects I disagree with, and if you get to do research, you can often show problems and affect the direction of the project. But after all, I could be wrong. I've done enough research to know that :)
This is exactly what scientists who commit war-crimes would say. I am not accusing you of anything like that but that's the logical extreme.