Cultures are important. They went a bit out of focus after WW2, being replaced by ideologies. But they never went away.
It was during WW1 that the communists noticed that troops were more inclined to die for their country (merely the physical location of their culture) than their ideology. In the 1930s, and based upon this realisation, National Socialism (Nazis) broke away from International Socialism (Communists).
Eighty years later in the West, the introspection brought about by the discomfiting mass immigration of Muslims brought culture sharply back into focus.
The whole history of the world has been a demonstration of the inadvisability of forcibly mixing cultures. A ‘multicultural society’ is an oxymoron. A society is composed of people with common traditions, loyalties and aspirations. The key to successful immigration is complete integration. Without it, there is conflict. The greater the cultural differences, the greater the conflict.
Just as there is no such thing as individual equivalence, so is there no such thing as cultural equivalence. Western culture, with its tolerance, respect for human rights, and its rule of law is a superior culture. Other cultures can mimic certain aspects of Western culture, but they lack the fundamental cultural pillars to flourish over the long term.
Without Western culture, the world would still be in the dark ages. The attempt to inflict multiculturalism on the Western world will, unless reversed, ensure that that is where we are returning.