"You set up a basis for cutural evaluation on the one hand with that statement, ..."
Nope - I said the world was better, I did not make any such comparision between cultures.
Unless you consider the world in total as a "culture" - I don't.
If you can't articulate them, or have no basis for determining what about individual cultures make the world 'better' rather than 'worse' then your initial statement is meaningless.
If you can, then you establish a basis for determining whether some cultures make the world mo' better than others, whether or not you choose to do so.