If a self were an object, it wouldn't have rights. The rights follow from our subjective aspects. We do objectify each other for various purposes, but when we reflect in a humanistic, existential, or spiritual way, we tend to appreciate the difference between what's most precious and what's monstrous and needs to be redeemed.
True, that humanism is in tension with the cosmicist side of naturalism that I try to bring out too. From the cosmic perspective, nothing's precious in the long run since monstrous nature wins out and extinguishes all life. That makes humanism tragically heroic at best, and demonically foolish and hubristic at worst.