Is it true that there is no absolute morality?

[WisdomOfTheTrees]

Well, you make it sound like doing things that would normally be deemed good, and things that would normally be deemed bad, isn't just an arbitrary choice like choosing chocolate or vanilla icecream. To be honest, the only reason why people are afraid to make such choices is because of societal constructs, which make people afraid of consequences or judgment. People feel in their "heart of hearts" that something is wrong, but that doesn't mean that it's logical or rational or reasonable. Take away these moral social constructs, and yes it is indeed very arbitrary. For people who break these tenuous social constructs, it's very demonstrably arbitrary. So to say that morality isn't arbitrary, when in fact it's just a tenuous illusion born out of dogma, is very obviously false. You don't seem to see the absurdity and utter pointlessness of life in the scheme of the cosmos.

The fact that they are mere societal constructs doesn't nothing to lessen their arbitrary or subjective nature.  If morality is merely a construct, then it is the same as choosing between chocolate and vanilla no matter how much law, police, or societal disapproval you put on the other side.  It remains just as arbitrary.

That is why I say "yes" to the proposition that an objective moral law exists.  I don't see how it could reasonably be otherwise and still be describing anything that corresponds to reality.

What you just said makes no sense what so ever. You said if it's a construct, then it's the same as choosing chocolate and vanilla icecream, regardless of societal constructs such as law or police or societal disapproval. Yes. I don't see how you arrived from that to objective morality, it's a complete leap to a different conclusion from what you outlined.