If you are coming to a blog post of mine that has been shared to you, my assumption is that you want to read my article, and not to be distracted by whatever performance is happening in the comment section. I am aiding you by not even putting a comment section there.
I realize there is a slim chance for there to be enlightening conversation in a blog comment section - but that is not what my blog is for. You are better served doing that here on HN or a more dedicated forum. Here it can be be more visible for others, for people who want to read discourse.
Pfft. Half of the fun on the Internet is arguing with people about what other people said. I like to link to this blog post with over 500 replies about a constructivist who doesn't believe in the well-definedness of real numbers and shows up in the comments to respond to people: http://www.goodmath.org/blog/2011/02/10/e-e-escultura-and-th...
I really do not believe that blog would be better by not having comments enabled.