You do realize that the vast majority of slaves in, for example, the Roman republic were slaves by choice, right ? Maybe there was a lack of alternatives avail

You do realize that the vast majority of slaves in, for example, the Roman republic were slaves by choice, right ? Maybe there was a lack of alternatives available to them, or at the very least they didn't themselves believed other good alternatives existed (the same as with student loans), but it still required them to agree to it.