What caused my second fav war criminal to join the Rebellion?

Has he joined the rebellion right after order 66? What motivates him is still unclear. He hates the Empire, but why? Is he even a ‘good guy’? I don’t think he is an ex Jedi. (Anakin is my number one fav war criminal).

Has he joined the rebellion right after order 66? What motivates him is still unclear. He hates the Empire, but why? Is he even a ‘good guy’? I don’t think he is an ex Jedi. (Anakin is my number one fav war criminal).