See post 19. I am unaware of any liberal who says that it is never right to lower taxes. I know of some conservatives (not Reagan) who seem to think it is never right to raise them. As I said, the trick is knowing where you are on the curve.
Since conservatives agree about the end points, but think that lowering taxes will always raise revenue, maybe they shouldn’t call it the Laffer Curve but the Escher Curve instead.