I certainly don't think we are always in accordance with our absolute human rights.
In a relativistic basis for rights, there is not "reviewing what we consider immoral", because morality is just "what every we consider moral". Slavery is moral (at least in 1850s America) because the consensus was that it is ok. Under an absolute basis for rights, it's clear that slavery was wrong then, and wrong now, and will always be wrong (regardless of what the law or consensus says).
