...So you pick up a history book to figure out US's angle
From Peter Dale Scotts: American War Machine-Deep Politics, The Cia and the Global Drug Connection, and the Road to Afghanistan
TL:DR the US turned Burma-Laos and Thailand into a heroin growing triangle (The Golden Triangle) much like they did with the Mafia in Sicily and Marseilles.
The Drug traffickers and drug money became a huge way of CIA to implant bourgeois ideology and suppress communists and the growing popularity of the PRC. They even used ex-Nazis as agents for drug smuggling. It also gave US unfettered access to Myanmars tungsten reserves.
This enitre coalition was directed at China of course.
Good example of why current communists should engage with theory and practices of the Mass Line. They have the feelings, but they don't have the language to describe their alienation.