No you didn't. You haven't justified why subjects have worth and rocks and grass don't. All you've said is that having it any other way would make morality "useless," which you haven't supported at all.
Idk why you brought up science here, as it seems rather irrelevant. "right and wrong" fall under the category of value judgement that I mentioned earlier. These can't be justified by logic alone as your unsuccessful attempts at doing so demonstrate.
If a moral system assigned moral worth to inanimate objects, what would be the point of the moral system? It is no longer a system for mediating undesired interactions, so why call it morality at all? I brought up the analogy to illustrate how this is a semantic debate. I'm arguing that morality must only cover a certain area in the way that science does; else the term would be too general and would be useless. Giving rocks moral worth is like giving Intelligent Design scientific reputation.
but you are desperately trying to exclude it from your definition of "ad hoc," all the while trying to shove every single other moral system into the category of "ad hoc," and since your definition of "reasonable" depends on your definition of "ad hoc," it's essentially the same action, but removed by a degree of separation.
I'll repeat my argument as I don't believe you understand all of it:
All moral systems must be reasonable. This means they must be logically consistent and free from ad hoc ideas. An ad hoc idea is one without justification. It's true "just because".
The claim that the purpose of morality is to mediate the interactions between subjects is not ad hoc for a couple reasons:
1. Negative, or unwanted interactions exist.
2. Nobody wants to be on the bad end of this interaction.
______
3. Thus a system can be placed to minimize this type of interaction. We can call this system "morality".
Now try to do this with any other system of morality:
1. God exists and demands that everyone follow a moral system
2. God only decided to tell a few special people the specifics of this system
______
3. Follow this system without question
Something seems terribly wrong here, doesn't it? Even when assuming the first two premises are true.
or
1. Happiness exists.
2. Everyone's goal in life is to obtain the highest happiness.
______
3. Moral decisions are ones that maximize the total amount of happiness.
This would be a reasonable purpose of morality if it were even somewhat possible to decide how "happy" or "unhappy" certain actions can cause people to feel in both short and long term. But it isn't even close to possible - not even philosophically. So this system cannot be accepted as reasonable.
Can you think of one that works?
fair enough. I suppose the amount of worth you assign to each subject is also the only "reasonable" one?
Way to keep the debate civil with your overbearing politeness.