Blogging is not writing. Not really. Sure there are a lot of similarities but there are plenty of subtle differences.
When writing an RPG book I have an audience in mind. That is a nebulous audience that I may or may not interact with. I don't know who bought every copy of The Witch or Ghosts of Albion or Buffy.
I do have the chance to get to know each and every reader here via the comments section. I post, you comment, I reply. There is a social contact at work here.. You are not expected to reply, but I write my posts hoping that people will.
Implicit in that is one of control. I try to keep my posts interesting to my known audience. This is one of the reasons I have different blogs. I control what I post. You control what you reply with, but ...I also control your reply. See I can delete any reply I don't like. But I don't. There are few good reasons for that.
I don't because it is dishonest. Having people disagree with me is a great way for me to learn something new. I have lost track of all the things I have looked into because some one said "no. you are wrong."
I don't because it violates the social contract we have. You put yourself out there, those were your thoughts. I may not agree with it, but that doesn't give me the right to shut it down.
I also don't, and lets be honest here, controversy and conflict means more hits, more audience and hopefully more people reading my stuff. Not fake controversy, people can see that a mile away, but real and honest.
A natural extension of that is I will also not delete old posts. I don't see the point. You may want to go back a read something I posted in 2010. Great! I will leave it there. Even if it something I don't agree with, like or otherwise grok anymore.
I have been seeing too many cases of people taking down posts, editing posts to put themselves in better light. Sorry folks, between Archive.org and Google cache people can find anything that was posted given time, so don't try to change history.
I'll remove a post of your own if you ask me to. I'll delete multiple posts if looks like you were fixing a typo or something. I'll delete spam.
That's my contract with you.
Your contract with me is not post anything to make be doubt this choice! ;)