Two things.
Firstly I acknowledge that the USA evolved to be the way it is for reasons (ie. the cold war), though I won't profess that I'm a professional on the matter/s. The few intellectuals I encountered there who actually had an understanding of why they were how they are offered a perspective I consider invaluable.
The second is that I don't think you can use multiculturalism as any kind of excuse for societal issues. Australia is one of the most multicultural countries worldwide, if not the most. We have surprisingly few social issues considering, and our biggest is the inhabitants prior to European colonization. Unlike most other settled continents we didn't slaughter the vast majority of the native inhabitants and so the scale of that issue is larger than in other places. Largely though things are relatively incident free, aside from events like the Cronulla riots, which while admittedly shameful, highlighted some of the issues of having people with different cultural values settle here in large numbers.
https://en.wikipedia.org/wiki/2005_Cronulla_riotsNot that Australia is the best, or better than everywhere else, but it is certainly better in some aspects particularly than other parts of the world. Like the USA. I'm astounded that the people there are largely ignorant to the glaring faults inherent to their culture. I will however say that fascism has it's uses. It's not wholly a negative thing. It was also interesting to compare issues such as racism (which Australia is renowned for) between the USA and Australia. I just wish the USA would be a little more aware globally and socially within their own nation. They seem to predate upon other nations to a larger extent than most, particularly among our close allies. Not that we don't do exactly the same thing. Anyone who thinks East Timor was about freeing an independent nation and not about gas is a fool.
Laying flat.