That’s likely to a large extent a product of the US’s two party system. In multiparty democracies, you’ll usually get a selection of right-wing parties, from libertarian/ hyper capitalist types to moderate conservative parties (think Merkel’s CDU) to hard right to fascists. In the US, to some extent they’re packed uncomfortably into one party (though some of the CDUish tendency ends up in the other party), and the authoritarian end of the spectrum is assertive and noisy and tends to grab the narrative.