I don't think you are talking about truth. I think you are talking about values. Right and wrong are meaningless in terms of truth.
If I hold a pencil up, let it go and it falls to the ground - that is a truth. It happened. Whether my letting it go was the right thing or the wrong thing to do is purely a value judgement having nothing to do with the event itself.
I am not sure of that...
If the same pencil someone said, "it will not fall down"
that statement of "truth" would be wrong
The decision to let go or not of the pencil seems to be
a different truth or issue.
Plus, the truths I am thinking of, are more global and consequential in their impact and
integral to helping mankind survive in the long run.
Granted, a society where murder was viewed, as never wrong
could survive; but how long?
Your example does show how much easier this is for the concrete physical world.
The law of gravity, outside of theoretical physics, does seem to be absolute. It is in effect, harder to deny.
For other things where subjective factors can be worked in,
it is more difficult.
Of course, the other dilemma, how do we really know when we are there?
We never really will.... we can only hope we move in the right direction
I was only offering the examples of murder and child abuse as areas
where the commonality of agreement that they are wrong, could be used
as "evidence" that there is some absolute truth.