So powerful in fact was the JCP, that the American occupation force used the threat of its rising power to coerce the defeated fascists into alliance with them and constitute what is now know as the Liberal Democratic Party. From here, it was a mere matter of providing them with massive subsidies and intelligence gathered on their opponents on the left-
https://www.nytimes.com/1994/10/09/world/cia-spent-millions-...
-and use the resulting power to produce a social, political, and economic order that was conducive to US interests.
I’m not certain what you’re getting at with regard to being “foreign” to American ideology, but authoritarianism is certainly not, if evidenced only by its long history and support of right-wing, authoritarian regimes.
Authoritarianism is hardly "completely foreign" to America.
But even if we ignore this, US government has a long established pattern of supporting any movement that opposes left wing politics across the globe to the point of funding coups.
The list is very long: https://en.wikipedia.org/wiki/United_States_involvement_in_r...