Damn straight. Why bother trying to take a moral high ground in a land where their may not be any.
That's no reason not to have any of your own. Neither for slavery to exist at all.
I admit that the only place where I'd have no morals is in a land where I wouldn't have faith in humanity anymore. But luckily Tamriel isn't post-apocaliptic Earth.
Besides, everyone saying they'd just free him/her, are most likely just sentencing them to death in a world that they aren't capable of handling.
Are you a seer, for deciding what are people capable of handling or not?
And anyways, if you're so kind of freeing him, you may as well pointt him in the correct way. Or contract him to *legally* work for you. Or make him your companion. There are a lot of options avaliable, not to rely on slavery. Much less if it's forced and non-desired.
Slavery is wrong. Period. I think it's one of those things in life where no arguments can be done to justify it. Because it's just simply impossible to justify it.