Saying that "some experts get things wrong" is no argument at all. More non experts get more things wrong. Credentials while not perfect or free from charlatans is a huge improvement of not having them.Another problem is experts can and have been wrong.
Would you take investment advice from Jim Cramer? He has plenty of credentials. Harvard degree, Goldman Sachs alum. He's also been spectacularly wrong so many times that he became a meme.
Vioxx must be safe. Experts said so - the experts at Merck who developed it and the experts at the FDA who approved it for sale.
I'm pretty sure those who are against them are just looking for shortcuts into higher paying jobs they are unwilling to make an effort to learn and become an expert. One measure of expertise is 10,000 hours of work. That is about 5 years of effort. Those for whom such a commitment is too hard, long, expensive, or whatever, want the rewards without the work. They are petty, small-minded, jealous, lazy and not very smart people. They are also probable poor employees and job hoppers.
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