When values are attached to physical sensations, there is an objective element that comes into play. You cannot subjectively decide what ice cream tastes like, though I suppose you can to a certain degree train yourself to like specific tastes. Still, your response is to something real (the physically existent ice cream) and not to something you made up.
With morality, it's different for multiple reasons. First, what is it referring to in the external world? You can value ice cream because its taste is grounded in objective facts about its chemistry and your biology, but what is it about something like world peace, for example, that would make you value it? If you can identify something about it that would inherently make it good, then you are a moral realist. If you cannot but persist in valuing it anyway, then you are being irrational. This is my problem with subjective morality: it is so much feel good irrational emotivism.
The second issue with it is that we want our values to bind not just us but other people as well. If you like chocolate and I like vanilla, that is obviously not the end of the world, but it would not make much sense to say that murder is bad for me, but you can go kill whoever you want. Why can I bind you to my subjective concept of morality?
All values are attached to physical sensations because all values are based on emotions. Nothing is inherently "good" because whether something is good or not is based on a subjective judgement. "World peace" is just a big ball of values. I think world peace would be great because pain feels bad and getting shot causes pain, etc... World peace means less people getting shot, which means less pain. Now full disclosure, I have strong sociopathic tendencies. So I don't "feel" the pain of others who are killed, but I can
sympathize to an extent. For me, mostly, world peace would be good out of the selfish reason that it makes it less likely that
I would feel the pain of war, but for most people they actually feel other people's pain through empathy, so it all still comes back to subjective feelings.
And so what if things are based on subjective feelings? Absolutely everything anyone (even God if He exists) does is because of some emotional drive. Well, there are some people who have actual psychiatric problems where they truly don't feel emotions. You might think they make the most rational choices, but they don't. They're crippled by indecision. They can't choose between using a blue pen or a black pen to write a not because they lack even the emotional drive of a tiny preference.
Now where I think your problem lies is that you think morals are based on feelings, but not really. Emotions create our values, so that's all subjective. And true, feeling a feeling isn't "rational". But when we choose how to act in a way that results in more good feelings than bad feelings, those choices are rational. Just because the feelings and the choices are tied doesn't make everything irrational. That's sort of the idea between anger management. Sure, you'll sometimes irrationally feel angry about the actions of others, but you can still make rational choices about your own actions in response to them.
Lastly, how do I push my morals on others? I try to only do so for the things that cause the most drastic changes, you know, murder and the like. But sure, my subjective feelings make me want to get other people to act in a manner that makes it more likely for me to feel good feelings. I guess that's just a matter of democracy. Thanks to empathy, and in my case sympathy, it's simple enough to determine the things that make the most good feelings in the most people in a lot of cases. What gives me that right? I dunno, might? Who cares? What does that have to do with me rejecting my own personal morals?
My reasoning here is very Platonic. It's not that God is being called good, but that God is the source of all of our concepts of goodness. Existence is not good because I have arbitrarily decided that it is good, but because it is by its nature good. If I disagree, I am wrong, and will suffer because of that.
The transcendentals refer to medieval philosophy on the nature of being itself. Goodness, beauty, truth, and unity are viewed as being attributes of God and therefore of existence rather than being created by us subjectively. Our finite experience of beauty, for example, is better described as a response to the mystery of being itself instead of just being an arbitrary matter of likes and dislikes.
If you can ever actually conceptualize what this sort of transcendentalism really means, stripping it away again does just leave everything empty. We become pantomimes, playing out some bizarre farce of meaning, with all of our subjective impressions about reality referring to absolutely nothing. But we cling to them because they feel good.
You're still losing me on this point. Talk to me like I'm 4. Because it still sounds like you are just defining "existence" and "God" as "good" which seems arbitrary.
I use the word "good" as a descriptor of something I like. Ice cream is good because I find it tasty (totally subjective). Getting a job to earn money is good because it allows me to buy chocolate ice cream (this is objectively true, is it not?). "Existence is good"? Maybe if you like existing... Some people have lives that they'd rather not have. If I didn't like existing, then existence would be bad.
Survival is itself a biological directive which you are following. Pain and pleasure are part of a physiological reward and punishment system meant to keep you obeying this biological directive. Everything we are is a result of our evolutionary heritage, so it is difficult to escape the reality that we are in our very being the result of biological programming. But to what purpose?
Except it seems we've gotten to a point that we can exploit the whole pleasure and pain part of our evolutionary heritage, haven't we? If everything drove us only to survive as long as possible, then diet and exercise would be a lot more fun for me. I choose other things that are detrimental to my survival because I enjoy them more than things that are beneficial to my survival.
Honestly, you're digging your own grave here with this analogy. You're going to get a lot of people up in arms if you compare following moral imperatives with doing things that are likely to get you more ice cream. This is why people think atheists are nihilists. (For the record, I do not have a problem with nihilism. I think it's a very defensible position. It's relativism that I consider idiotic.)
That said, moral nihilism doesn't imply that you should refrain from acting in a "moral" way. Some nihilists will argue against traditional morality, but others will say it's a useful fiction. The question is whether morality is actually coherent. If you think it's subjective but real, you're either going to end up with something very paradoxical or be operating under a totally different definition of the word "morality."
Heh, I guess if I said that "I like chocolate ice cream" was my
one and only value, you might have a point. Heck, even if it was, I would still model morality in what would commonly be considered a "good" way.
Consider this, I could kill someone for their chocolate ice cream, but that would put me at greater risk of being killed in self defense, and then I would
never get any chocolate ice cream again! Heaven forbid!
So maybe I could steal it, or money to buy it, and then I'd risk going to jail and being denied chocolate ice cream for a while. Not as long as forever, but still too long to go without chocolate ice cream.
So I think it's best to get a job, earn money, and buy my chocolate ice cream legitimately. That objectively gives me the best odds of getting a steady stream of chocolate ice cream for as long as possible.
But maybe my love for chocolate ice cream will drive me to be a glutton? Well, to a certain extent, maybe (in my personal case, kind of). But if I eat too much chocolate ice cream then I could end up a diabetic, lose a leg or two, and that would seriously hinder my ability to go to work, earn money and buy more chocolate ice cream, so I guess I need to find some moderation.
So there you have it, a love of chocolate ice cream has caused me to decide not to kill, steal, or even over indulge just for starters. Sounds like a great starting point for morality to me.
How is subjective not real? Why do you think that something can't be both? My good feelings when I eat chocolate ice cream are as real as anything else I can confirm. I certainly find morals useful, but I don't see why anyone would call them a fiction. If my subjective feelings are real, and if there are real ways to cause those feelings objectively more often than other ways, what is fictitious?
ETA tl;dr version:
What motivates us to act is irrational and subjective, how we choose which way to act can be rational and objective.