But that clearly falls within the parent comment’s definition. Just because you are prepared to change your opinion on something based on evidence to the contrary, it doesn’t mean such evidence exists or may even be possible! I am of the opinion that the Earth is not flat. And I know that no evidence you can present would ever change that because it’s patently obvious that’s the case given the evidence I already have! But I am still theoretically open to a debate. That’s the scientific method.