The war on drugs is a scam, but pretty sure if the primary goal was to oppress indigenous people in another country the US government could’ve found a cheaper way (both fiscally and politically).

Yeah, it's more of a cherry on top than a primary goal.

I don’t think Nixon cared about indigenous people in South America. Not because he was a great guy, just because they didn’t matter to him even slightly. He definitely cared about communist militias though.