Hedonism is only a theory within ethics. Where do you leave all its opponents? — David Mo
As not actually philosophy at all, in the end, because they ultimately end up saying there is no way to tell what is good or bad. Leaving room only for religion or else sophistry with regards to ethics, which we have already established are not philosophy.
One's own experiences are very different from scientific ones. These concern inter-communicable experience of external objects. They are or try to be objective. If you restrict philosophy to personal experience this would relegate it to subjective. — David Mo
Objectivity is just the limit of inter-subjectivity. Every scientific observation is just a bunch of people confirming that they too also share that same subjective experience in those same circumstances -- or else figuring out what the differences are between them that account for why some do and some don't.
The same can be done with hedonic experiences.
With regards to opinions about reality, commensurablism boils down to forming initial opinions on the basis that something, loosely speaking, looks true (and not false), and then rejecting that and finding some other opinion to replace it with if someone should come across some circumstance wherein it looks false in some way. And, if two contrary things both look true or false in different ways or to different people or under different circumstances, commensurablism means taking into account all the different ways that things look to different people in different circumstances, and coming up with something new that looks true (and not false) to everyone in every way in every circumstance, at least those that we've considered so far. In the limit, if we could consider absolutely every way that absolutely everything looked to absolutely everyone in absolutely every circumstance, whatever still looked true across all of that would be the objective truth.
In short, the objective truth is the limit of what still seems true upon further and further investigation. We can't ever reach that limit, but that is the direction in which to improve our opinions about reality, towards more and more correct ones. Figuring out what can still be said to look true when more and more of that is accounted for may be increasingly difficult, but that is the task at hand if we care at all about the truth.
This commensurablist approach to reality may be called "critical empirical realism", as realism is the descriptive face of objectivism, empiricism is the descriptive face of phenomenalism, and what I would call a critical-liberal methodology is more commonly called just "critical" as applied to theories of knowledge.
On Morality, Goodness, and Justice
With regards to opinions about morality, commensurablism boils down to forming initial opinions on the basis that something, loosely speaking, feels good (and not bad), and then rejecting that and finding some other opinion to replace it with if someone should come across some circumstance wherein it feels bad in some way. And, if two contrary things both feel good or bad in different ways or to different people or under different circumstances, commensurablism means taking into account all the different ways that things feel to different people in different circumstances, and coming up with something new that feels good (and not bad) to everyone in every way in every circumstance, at least those that we've considered so far. In the limit, if we could consider absolutely every way that absolutely everything felt to absolutely everyone in absolutely every circumstance, whatever still felt good across all of that would be the objective good.
In short, the objective good is the limit of what still seems good upon further and further investigation. We can't ever reach that limit, but that is the direction in which to improve our opinions about morality, toward more and more correct ones. Figuring out what what can still be said to feel good when more and more of that is accounted for may be increasingly difficult, but that is the task at hand if we care at all about the good.
This commensurablist approach to morality may be called "liberal hedonic moralism", as moralism is the prescriptive face of objectivism, hedonism is the prescriptive face of phenomenalism, and what I would call a critical-liberal methodology is more commonly called just "liberal" as applied to theories of justice.
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When it comes to tackling questions about reality, pursuing knowledge, we should not take some census or survey of people's beliefs or perceptions, and either try to figure out how all those could all be held at once without conflict, or else (because that likely will not be possible) just declare that whatever the majority, or some privileged authority, believes or perceives is true. Instead, we should appeal to everyone's direct sensations or observations, free from any interpretation into perceptions or beliefs yet, and compare and contrast the empirical experiences of different people in different circumstances to come to a common ground on what experiences there are that need satisfying in order for a belief to be true. Then we should devise models, or theories, that purport to satisfy all those experiences, and test them against further experiences, rejecting those that fail to satisfy any of them, and selecting the simplest, most efficient of those that remain as what we tentatively hold to be true. This entire process should be carried out in an organized, collaborative, but intrinsically non-authoritarian academic structure.
When it comes to tackling questions about morality, pursuing justice, we should not take some census or survey of people's intentions or desires, and either try to figure out how all those could all be held at once without conflict, or else (because that likely will not be possible) just declare that whatever the majority, or some privileged authority, intends or desires is good. Instead, we should appeal to everyone's direct appetites, free from any interpretation into desires or intentions yet, and compare and contrast the hedonic experiences of different people in different circumstances to come to a common ground on what experiences there are that need satisfying in order for an intention to be good. Then we should devise models, or strategies, that purport to satisfy all those experiences, and test them against further experiences, rejecting those that fail to satisfy any of them, and selecting the simplest, most efficient of those that remain as what we tentatively hold to be good. This entire process should be carried out in an organized, collaborative, but intrinsically non-authoritarian political structure.