Over the years, those who have added their comments directly underneath a post have been in the large part agreeable and positive.
On the other hand, readers with ideas contrary to my own, seem to send email directly to me. Sadly, they do not, for some reason, choose to post directly on the weblog. Without your permission, I will not take the comment you've sent me personally, and tack it onto the blog. The readership in general loses the opportunity to learn from you.
Any comment, whether in agreement or not, made in the positive spirit of debate, is valid. You are encouraged to disagree.