Is it not always a good idea to hear both sides of the story?
It is important to know personal experiences as well in addition to the resources which are typically written by biased humans\professionals.
You would listen to the positive cases right? then you will want to listen to the negative cases too in making a decision without assuming it won't happen to you. That's what the detrans expected and they criticize the assumption that 'its very rare it isn't successful, detrans cases are rare.' It's not as rare as they say and it happens.
Whole information which op is looking for must contain both sides. The negatives can't be overlooked when making informed decisions.
Please note where I said the information provided is relevant and important, but also biased.