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@ResurgetExFavilla
The left constantly points out that the right uses cultural friction to divide the working class against itself and reduce solidarity, and they they're right. Because of this, multiple cultures within a society make it much easier for a corporate entity to solidify its power because it creates multiple fracture points in the working class for them to exploit
You seem to be assuming a Marxist class analysis which ignores the corporate structure of the state itself. It is inevitable in any society that various firms will attempt to "solidify" their power, but in multicultural societies with strong markets it is much more difficult to establish the kind of totalitarian control possible elsewhere. Both the communists and the nazis and fascists required a myth of shared heritage and national identity to rationalise their rule. All these systems claimed to represent workers' solidarity, and leveraged cultural hegemony to legitimate their claims.
Free movement of labor is not 'an essential component of the market'; that statement is prima facie absurd since markets have existed long before labor mobility has.
Although thinkers like Ricardo had not developed the theory of marginal utility, and were thus confined to theorising rudimentary markets within the bounds of the 'closed commercial state,' even in the 19th century we can see the germs of globalisation that led to the massively expanded global production cycle that exists today. Labour mobility, in my opinion, is an essential component of today's market, which produces goods at a scale and efficiency which was previously unimaginable.
The bad combination of a widening wealth gap, a working class increasingly incapable of organization, and endless credit bubbles and speculation on bad debt severely destabilizes governments.
It is unclear how much of what you listed is related to immigration, but immigrants have proven to have a very high social mobility, and are likely to reduce the gap between capital owners and workers. As for working class organisation, this is not a preoccupation of mine, but if immigrants were legalised and able to join unions, claim the minimum wage, and so on, this expanded workforce would presumably greatly increase the influence of the working class.
People aren't more creative nowadays. Far from it. The combination of multicult and the metastatization of pressure to conform within online/urban/suburban communities has lead to the bleeding of separate, vibrant cultures into grey, consumerized porridge, It's the exact opposite.
Which genre today is inspiring more people, rap or country music? Which is experimenting more with sound, exploring new territory? I don't see what you are referring to here, since it seems to me that there is much more creativity in art today than ever before, and especially so in multicultural urban areas.