If a doctor told you to jump off the Golden Gate Bridge, you would do it?
I wouldn't. I go to great lengths to double check or have skepticism about what doctors say. But a lot of people would. I run across many people who trust their doctors implicitly, no matter what. Are you going to prosecute all of them? Ideally, you are supposed to trust your doctor.
Look at the Dept. of Agriculture Food Pyramid. People went by that for years, and it still isn't where it should be.