The difference between a rock and a person from a moral point of view is that the rock is not free. Therefore, the rock has no rights.
The difference in practice is that if the rock threatens my property the most effective way to prevent it is to destroy the rock. And no one will condemn me for it. If a person threatens my property the most effective way to avoid the threat is to eliminate him. But I will end up in a criminal court. Why? Because human have rights.
If you were, for instance, a warlord in ancient China, you could eliminate the person presenting a threat to your property with no more consequences or remorse than destroying a rock. Does that mean ancient Chinese commoners lacked free will? I would think any definition or determination of free will that applies to humans has to be independent of cultural or historical circumstances.
Rights do not depend entirely on free will either. A person in an irreversible vegetative state in a hospital still has rights. You can be prosecuted for mishandling or mistreating a human corpse. That is not because corpses have free will.
For a determinist this doesn't make much sense because the human being is not free. He should look for some explanation to why we can't eliminate the human beings that bother us just like we do with rocks. I don't know that explanation.
I tell a loose overhanging rock not to fall on me, because it would cause me harm. This is ineffective. There is no correlation between doing so and the likelihood of the rock falling.
I tell a person not to switch on the circuit breaker panel while I am working on the wiring, because it would cause me harm. This is usually effective. There is an extremely strong (negative) correlation between doing so and the likelihood of being electrocuted.
What's the explanation of the difference? In the latter case I'm interacting with an entity that has a brain.
As I've repeatedly pointed out, and you've made no attempt to refute, determinism does not imply that brains cannot function.
We have lots of different models and terminologies for evaluating the outcomes of brain function. If the person I tell not to turn on the panel turns it on anyhow, because he was having a petit mal seizure at the time and didn't hear me, we regard that as a medical or more specifically neurological problem. If he turns on the panel because he's having delusions that a demon is forcing him to do so, we regard that as a mental health problem. If he turns on the panel because he forgot what I told him a few minutes earlier, we call that carelessness or irresponsibility and regard that as a character flaw. If he turns on the panel because he hates me and wants me to die, we call that attempted homicide and regard it as a criminal and/or immoral act.
But those are all just mental and philosophical models that we use to evaluate patterns of behavior. There is nothing special about the last one, which we sometimes call morality, that requires nondeterministic causes of behaviors in order to be applicable. Like all the others, it only requires brains generating behaviors, and social standards to evaluate those behaviors.
Also, those models, the distinctions between them, and the ways we use them to manipulate future human behavior to our own or society's general advantage, are not fixed. A few centuries ago, the person with the delusions might have been subjected to a traumatic or even lethal exorcism, the person with the seizures might have been honored as a mystic, the irresponsible person might have been executed for damages caused by his lapses in judgment, and the homicidal person might have been able to justify his actions on the grounds of vendetta for some past wrong or insult, and gained in reputation from it. We apply different standards today. Yet I don't think the universe is any more or any less deterministic now than it was then.
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