Comment by v21

He's not presenting it as evidence, but saying that it can help to illustrate a pattern of behavior. There's still the larger, more important task of showing that that pattern of behavior exists in the world, but this allows exemplars of this pattern of behavior to be internalized. The internalization process is obviously dangerous, but ultimately I'm not smart enough to make rational judgments on most things, so I need to rely upon intuitive understandings of things.

(Though one could argue that stuff like this : http://www.youtube.com/watch?v=oLhFXkvugLM&feature=youtu... can be used as evidence of showing how leading language can work, if you can feel your own opinion being swayed, as Bernard talks. The extent to which one can rely upon one's own feelings of their opinions is another matter... but it's a stab in the right direction.)