Blogger and reader
To my mind, a blog is like a virtual tea kadai/barber shop conversation. The blogger is the guy who reads out the Daily Thandhi loud to stir up a discussion because he is vetti (especially non-commercial personal blogs like mine). A commentor is the person who is the virtual equivalent of someone taking part in tea kadai discussion. There is no compulsion on any party, the blogger can stop reading his Daily Thandhi, the listener can move on to another tea kadai. Anything goes so long as basic decorum is maintained. Nobody is right since nobody is an expert even though some precious insights may just as well emerge despite the air of ignorance.
Okay, so who takes the role of abusive anonymous commenter then? I guess he should be the one whose main job is to pelt stones at political rallies. The same sort of people who do graffiti in train toilets. Worse some even do not close the door properly while rendering their toilet masterpieces.