Confused and Bizarre prosecution of persecuted Hmong

The U.S. government is prosecuting Hmong and Laotians in the U.S. for plotting a coup against the communist government of Laos. This a mere 30 to 40 years after the same U.S. government spent untold dollars carpet bombing the small nation with more bombs than were dropped on all of Europe during world war 2 in an attempt to ... stop communism from expanding in southeast asia.

(oh, but that's right--communists are ok now. We have a new enemy: the "terrorists")

Worse, the Hmong, who were U.S. allies during the aforementioned war, were promised support in exchange for their active help and then abandoned to be slaughtered upon our withdrawal from Vietnam.

I can't figure out a way in which we're not the bad guys in this scenario.