Well, I think therein lies the problem - as far as science is concerned, individual testimonials don't equal evidence, it's the overall effect of all the individuals - if a medicine saves 1,0000,000 lives but has side effects that injure 100 people, that's a disaster for the 100 people, clearly, but great news for the million, and while it's worth searching for a better medicine, in the meantime, I'd happily take those odds personally. However, if you just listened to the 100 injured, you wouldn't get that helicopter view.