The propaganda of a people is as much a consequence of belief as a cause. Strongest case in your favor is probably Nazism, core Euro group embracing extreme ethnocentrism. But read the Bormann-Hitler transcripts to see what Hitler thought of the Germans propensity for racialism
The fact that Europeans have embraced collective identities in the past means identitarianism is not doomed to failure. This much is true. But individualism is not the mere product of modern propaganda