Honolulu has a bunch of brutalism, along with a bunch of other architectural movements

https://thinktechhawaii.com/more-tropical-brutalism-humane-architecture/

I had to screen grab it, but there is actually a brutalist bhudist temple in Chinatown in Honolulu

I would say "socialist modernism", not " soviet brutalism". Because there are a lot of examples not from ex USSR.

This is Belgrade, Serbia (ex-Yugoslavia):

Museum of Modern Arts:

Hotel "Yugoslavija":

So, no, it’s not anything political. It’s a cultural thing.

Soviet housing either followed or was contemporary with Le Corbusier's ideas of affordable ‘habitation units’, the now-famous cookie-cutter blocks with minimal decoration. The OOP is quite correct in calling it leftist, since the purpose was to have lots of cheap housing: the USSR had huge expansion of it during the fifties-seventies, with massive migration from rural areas to cities (following the less-neat redistribution of housing, wooden barracks, and communal living in the thirties).

Can't say I like the outcome too much, because arguably same population density can be achieved with lower-rising houses, since they don't require huge areas between them to have any sunlight. Khrushchev-era districts can be much cozier than later ones, since five-storey buildings are placed closer and have trees right outside the windows.

Love me some brutalism.