The Struggle against Genocide accelerated by greedy bureaucrats
Multiculturalism and flood of immigration is accelerated regularly by greedy bureaucrats. Politicians are your enemies.
However Multiculturalism and "Diversity" are only tools to weaken the already diverse European societies.
Arts, sports, sciences, languages, farming, medicine, military, etc. The lists are endless where European societies retain the highest levels of innovation maximizing the diversity enjoyed within European cultures.
The how or why of it is interesting to study but the current state of things is irrefutable. Europeans, as nation groups and countries, retain the best education, highest wealth creation, peak intelligence of all human species.
Multiculturalism is a lie. No one culture is preserved by this multicult. Each is washed down to foods, clothes, and maybe music and religion. Deep aspects of cultures that are rooted in their genetic makeups are ignored or intentionally downplayed. Song and dance, behavior, customs and traditions, reasons for daily life and so forth. There is much in each culture that is unique to the group of people from which it springs forth. Cultures can not actually be practiced by any people simply by fact of being raised in them. The blank slate theory has been refuted many times and it continues to be used as the basis of ideologies that assume we are all the same and people only need to be taught the right ideals to be just the same as people with other cultures.
Humanity is stronger than that. Healthy world, truly rich in diversity, is a world where each nation has its own land and is not subject to foreign rule. Therein people protect their own and work truly in the best interests of their neighbors.
https://archive.is/Oacus