Only hard facts change your perspective?

Lacking happiness or charisma or confidence or the ability to quit smoking or any other run-of-the-mill self-help topic isn’t caused by a lack of relevant data: it’s a matter of perspective. Often, the best way to push through the problem is getting the perspective of someone that’s thought about it more. Whether self help books are an effective medium for that is another topic, but if they’re not, lacking hard facts wouldn’t be the problem.