You made the claim that all cultures have changed the world for the better. To make that statement surely you must have some ground on judging what is 'better'. You set up a basis for cutural evaluation on the one hand with that statement, and then deny the concept entirely with your following statements.
"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.
I am sorry to but in but IMHO these are the things that make the world better:
health care, governance, opportunity (strong economy), exploration, entertainment, technology, communication, education, transportation, first responders, strong military, family, Love for God, beer, the Centerfold, and people who educate their children so they are immune to a college professor's liberal babble.
