It is entirely possible that they were idealistic when they joined about what they were doing and have since changed their mind. Which is why it is possible to become a conscientious objector even after enlisting. Tho most people who regret joining will do something else to get kicked out or just wait out their time.
Until the push really comes to shove we won't know if they will "defect"
and this gives you power over me
Bane is a working class hero.