Conspiracy theories are not the antithesis of logic and reason. A conspiracy is two or more people agreeing to commit a crime. There are conspiracies out there, some of which involve people in our government and business as well. There are also things that have happened that could be the result of some sort of conspiracy, which may turn out to be "sensational." To deny that would be the antithesis of logic and reason.
The drug companies have a vested interest in selling drugs, and they sell a lot of them. Regulatory capture is a well documented phenomenon. Government-business cartelization of various industries (e.g. banking) is also a well documented phenomenon. Okay, a few of the statistics cited are no big deal, but some of them are, especially the number of children and teenagers who are on some sort of medication. And just read, if you can find a magnifying glass, the tiny print warnings that come with antidepressants. They do indeed mess with your head, as many people who I know who have taken them will attest. I think the statistics supply some of the "reasons to be concerned with the amount of drugs used," and the whole article cannot just be dismissed as "sensationalist hogwash" or "sensationalized conspiracy theories."