One thing I haven't seen brought up in this thread is that a belief that morality is subjective and evolves over time opens one up to the possibility that their concept of morality could be entirely mistaken, and to the idea that we must continue working, bearing history in mind at all times, to create a better morality in the future.
depends on how you define "subjective" (no, not going to go into sematic argumentation mode here). for myself, morality definitely is a relative thing, primarily relative to those, in any particular situation, who are involved, but i see it as a continuum ranging from the individual at the smallest level, to the group / society at the largest -- "society" including all with any sort of relevant interest in the situation, which doesn't necessarily exclude other religions, nations, etc. -- but there is definitely a reality-based component too. morality is not simply all subjective opinion, and all moral systems are not equal; i have yet to actually encounter anyone who really operates on a basis such as that, regardless of their philosophy.
there's no hard-line, black and white way to look at it, really. as is said, "one law for the lion and the lamb is tyrrany", and i don't think that historical moral / ethical structures are all equally qualified to make all normative moral statements in the modern context. all are lacking, to one degree or another, and i mean all -- both systems based in religion, as well as systems based in logic or philosophy.
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