The measure of the level of achievement of any civilization is not relative but

The measure of the level of achievement of any civilization is not relative but absolute: the greater the suppression of free riding (property rights) and the faster the adaptation of prohibitions (the common law), producing the highest standard of living (purchasing power), producing the most innovation (technology), with the lowest corruption (parasitism), producing the greatest inter-temporal commons (monuments).

So no. Morality isn’t relative.

It all comes down to truth-telling.

Truth telling is the most expensive commons that a people can construct.