Anti-depressants can do more harm than good in a certain segment of the population, but that in no way means that they are inherently more harmful than beneficial to society. Brain chemistry is very complex, and far more goes into a person's happiness than certain levels of certain chemicals at one time. Ultimately, while anti-depressants can do good for many people, some people could end up with adverse reactions.
As a person who suffers from anxiety disorder I can say that yes sometimes anti depressants can do more harm than good. If you watch a commercial for any anti depressant the side effects always the possibility of suicidal thoughts, which is just ridiculous. Then there is the fact that in recent years a booster for these antidepressants have been made, which I think is a clear example of our problem. These pills may or may not help you and they may or may not be efficient.