I am saying that non-expert celebs who sound off about things unrelated to the reason for their celebrity should perhaps be viewed through a lens of scepticism.

And I view such sweeping dismissal of the general intellect of all people in the public eye as nonsense. Each must be taken on their own merit. I don't find Rowling's intellect to be lacking, so she may speak about what she wants to. Now Trump, that's another story. He can shut up from the get go. See how that works?