The two concepts could serve as a rhetorical crowbar:

Is this the kind of invisible dragon that isn't really there but you're in denial? ...or the kind that IS really there but you're in denial?

This in turn makes me think that there are some kinds of evidence that affect our behavior, and other kinds that affects our beliefs, and only partial overlap. (E.G. you know the dragon is there but you're not evolved to be as afraid as you should be, because you can't see, hear, or smell it.)