I definitely feel this is a good idea. The biggest issue when it comes to anytime of cyber security is human beings and the trust we give to others.

This would be esepcially prevelent if the user has a very high reputation. With high reputation usually comes more trust. I think it is definitely necessary to be able to hide comments regardless of their level.

Why is there a need for this protection if the 65+ rep trust is inherent. Obviously, if the post garnered enough downvotes to hide the post, that person broke that trust and deserves to have a post hidden.

Just my thoughts.