This is also called the “Argument from Authority.” Perhaps it is better understood as “The Misattribution of Authority.”

Simply stated, just because someone is an expert in one field does not qualify them to be an expert in other areas.

Some examples are easy to see. Your mechanic may be the best on the planet, but that does not qualify him to give marital advice. Someone might be a great ball player, but that does not mean you should listen to their thoughts on investing your finances.

Other examples are more complicated. A famous actor may not be the best person to teach morality. A popular writer might not be the person who should give psychiatric advice. A well-known podcaster is not your best source for unbiased news. And even a preacher, like me, needs to know his limits.

Be extremely careful when accepting someone’s authority on a topic because you like what they have to say about some other subject. People are often led astray by those with good intentions.