A multicultural society is not a free society.
In my opinion the case against multiculturalism was set the moment it was suggested, the horrors of it being known well in advance, but the article is worth reading nonetheless. The case has to be made against it using present day examples in order for the average non-interested citizen to be woken up from their stupor.
NOTE: In order for the multiculti project to get a firm grip within any society, it needs a statist environment to help it take root. It’s all about group identity and class warfare, as opposed to individualism and sound free market competitiveness, hence the role of the state and the vanguards of it, (the statist Left and the neo-statists in the faux conservative parties) who strive to protect it at the expense of your liberties.