You might want to quote some portion of the article you are using to back what you are asserting, maybe?
According to this article, it seems to be quite the opposite of what you mention?
The robust narco-economy is the source of half of Afghanistan's economic output. As the underground economy grows, so does the power of regional warlords - including the resurgent Taliban. Eighty-four percent of poppy production, said Larry Goodson, an Afghan expert at the U.S. Army War College, takes place in provinces now controlled by the Taliban and two other factions opposed to the U.S.-backed government of Hamid Karzai.
U.S. lets Afghanistan traffic in opium
Then the government of Afghanistan herself states that they have corruption problems:
Kabul government concedes officials assist drug trafficking
I think what is missing in your argument and stance is that the Afghanistan is back and is once again a sovereign nation/state; with its own head of state, its own government, its own laws, regulations, and institutions. That despite US and Coalition troops still within Afghanistan, in their continued mission within the WOT, these same US and Coalition trops are not there to enforce Afghanistani laws, regulations, etc. The US and Coalition can assist Afghan drug prevention offices and institutions, along with offering ideas on how to combat this problem, that was present and was a problem before the US engaged the Taliban, but its apparent that there is an ongoing continued need to secure the country, as well?
As your own article stated or mentioned, there are problems that need to be addressed and prioritized. That the solution is complicated, with no easy answer, but strategy(s) are and will be developed, and not entirely by the US and Coalition, but by the sovereign Afghanistani government.