Because this is what the USA has always done: it is the place all brutal right-wing dictators who manage to escape a revolution flee to (at least at first). Here's a list of the right-wing dictators I know of who made the USA their home of permanent exile:

1. Paul Magloire
2. Julio Lozano Díaz
3. Manuel A. Odría
4. Marcos Pérez Jiménez
5. Syngman Rhee
6. Joaquín Balaguer
7. Lon Nol
8. Nguyen Van Thieu
9. Ferdinand Marcos
10. Prosper Avril

I've probably missed a few, and this doesn't include the people who fled to the USA only to make their final home elsewhere (like the Batistas).

But it's pretty normal for right wing assholes to make the USA their home and political base. Almost as if the USA was telling people something.