I've got to agree with r9etb. I think that if you examine the other stories in the original on-line publication, it has a pretty liberal viewpoint. If we disregard the pro-vs-anti pot issue for the moment, the general trend of the on-line publication is anti-establishment. People with this viewpoint tend to believe that the U.S. is the bad guy in all things.
Now pull in the juxtaposition of the "Kill the Pot"/"Eat the Eyes"/"Kill the Kids while you are at it" themes. Of course, every story needs a hero, so we get to bring in the wise and protective Columbian government. It seems to be a pretty transparent propaganda piece.
As I tried to convey above, there is a lot of unrelated and certainly not science-based information pulled together to create a nice hit piece. Most Freepers can see through the Islamist propaganda pretty clearly, this is the same tactic in a different subject area.
You may be right about the lack of scientific validity, but r9etb's claim is that the article implies that the US is behind a plot to intentionally blind drug users. It does no such thing.
It claims that the fungus is dangerous, but it comes nowhere near implying what r9etb says it does.