[Small rant] There are huge economical incentives to scold those who question medicines with high amounts of side effects. Do people really believe that big pharma doesn't account for a good share of the astroturfers online?
To give one example: In Sweden a vaccine for the pigflue caused narcolepsy in completely healthy young individuals. [End rant]
The problem here is not truth or how it's used to effect but foremost the missinformation that is blocking out all traces of it.
Truth helps any discussion and creates trust - which the vast majority of societies are built on (or used to be).