Ah, is slavery right or wrong for me? For me, I would prefer to do without slavery, but in situations where the alternatives are to kill the person or be killed, I would definitely prefer slavery.
Imprisonment, in a sense, is a form of legalized slavery. In some cases, prisoners actually work like slaves. In many, they are simply held for a predetermined period of time. It's interesting how imprisonment works, I really oughta to do more research into it.
Actually, like all human beings, Muslims differ in their views. If you're looking for a homogenous group of followers who never question what they read, look elsewhere.