Ah, now this article I agree with. It disproves everything you have said. You should try reading this article you linked. It claims the opposite of what you claimed about America.
So according to your link America is trying to stop the Taliban from using opium exports as it is the main source of Taliban funding. So what is your story now?
Yes, because the Afghanistan government used it for revenue. The Americans just stood by and let them. It wasn't Americans growing it,or making them. It's what the farmers there grow.