Sure experts can make mistakes. Which is why it makes an enormous amount of sense to avoid taking the opinions seriously from people that are not even experts because they are significantly more likely to make mistakes based on incomplete knowledge or poor understanding of it.
Imagine drowning: If we were talking about expert lifeguards vs. some random beach goer and you had to choose which would try & save you, would you choose the expert lifeguard or the random person?
And sure, Lao Tzu may be right about compassion. It's also irrelevant in this discussion.
If you're listening to a comedian then your mind should not be open to any scientific statements that person makes or medical advice they give.