My mother-in-law’s friend had lost weight taking a diet pill before it was found to cause deterioration of cranial bone cells. (Her constant runny nose had proven to be the leakage of Cerebral-Spinal Fluid from holes in her skull caused by this pill!) But, even after finding out, the friend said, “I’m not going to quit taking it. I’ve lost 25 pounds!”
This is a radical example, but most of us won’t change stupid stuff even though our behavior defies reason (and really smart people tell us so). We hang on to delusions for dear life.
This probably explains Donald Trump’s hair.