A neurologist said to the patient: The synthetic drug S that appears on the market has a good effect on insomnia, but because the long-term side effects of S are not clear, I do not recommend this drug. Some patients retorted: Your words and deeds are different, and you have prescribed a lot of drugs with side effects to me, so the real reason for your refusal to use drug S is not its side effects.
the reason?
Known risks can be reduced by specific methods, while unknown risks cannot.