Yeah, well I haven't seen any spokesman in the U.S. saying to treat for parasites so your theory doesn't hold water. Also of the pharmaceutical industriy is about the money. Guess what, so are many alternative medicine doctors and herbal providers.
There is a reason some alternative medicine doctors like Dr. Klinghardt and Dr. Simon Yu prescribe parasite medications rather than just herbs, it's because they have found the medications to be stronger in killing parasites, in more other cases they might recommend herbal treatments but you can do your research, they recommend parasite drugs and I doubt they have much invested into the pharma industry.
Also notice I'm not saying that my way is the best for everyone but you seem to think that about yourself.