When it comes to celebrities in the entertainment world, I would say they are less connected with everyday reality than almost anyone else, so why would anyone want their opinion on anything of a scientific nature? Uness they’d had a background in some scientific field,which is highly unlikely, they are doing the country a disservice by even speaking up on such things.
This is a good point. We tend to think artists and actors should shut up and sing. And, in general, they should.
But let's consider us FReepers for a moment. Can't the same argument be applied to us, e.g. I'm not a scientist so shouldn't I shut up when it comes to global warming? What are MY credentials?
Let's say my hobby was global warming and I've read tons of books etc. Maybe I am well-read on the subject...wouldn't that give me SOME standing to speak on the topic?
If that is true, then by extension any artist/Hollywood person should also have some standing to speak on the topic.
What you have said, is that you have to be connected to everyday reality AND have knowledge on a topic to speak with authority.