That's not entirely true. IANAL, nor am I familiar with this particular area of the law, but many places of the law include the concept of a "reasonable person"

That's not entirely true. IANAL, nor am I familiar with this particular area of the law, but many places of the law include the concept of a "reasonable person". That is, whether you have acted as a reasonable person would act. In a place where the law is clearly defined, you're correct, that wouldn't help. However, when the law is vague, a documented conversation like that is definitely good evidence that one was acting reasonably.