I think, perhaps, the only reason I don't turn off commenting capability in my blog is that no one ever comments directly on it. The only comments I receive are via the automatic cross-posts to my FaceBook page. Thus, I don't have to view, on my own blog, the mind-bending stupidity that is the norm for comments on various Internet news sites.
For instance, it always amuses (in truth, "bemuses" would be a better term) me when someone declares something to be a "mute point". I can almost picture the poster drooling on the keyboard, as he taps away his witty ripost ...all while wearing a damned hockey helmet.