There is nothing in my comments rising to the level of deleting them.  Either allow commenting or not.  Selective censorship is not the answer. 

 I have rated comments here based on whether they have false content, not on whether I agree with that content.  Comments with false content receive a "no" as to whether they are good comments.  I rate civility independently of the content.  There have been one or two comments which were obviously not civil, but all others  I have deemed to be  civil, regardless their content.

Steven D. Slott, DDS