People have asked why I delete old journals, and some seem to think it's because I try to hide something, but it's really just because my journals are always very "in the moment", something I'm thinking about at that very moment and want to see what others have to say about it. Then I read people's comments and either change my mind or think my point has been proven, and the next day I've moved on and no longer care.
Unfortunately new people keep seeing the journal entry and keep commenting on it, and because you can't block comments on journals it just becomes an annoying filler in my inbox.
Or people will find very old journal entries were I say things I've changed my mind about long ago and talk about it as if I'm still thinking like that.
So after letting people have their little fights and such for a week or more I delete the journal and move on.
I know some people think it's annoying because they were having a good discussion, but strictly speaking my journal is not a forum so I can only suggest you remember the name of the person you were talking to and contact them if you want to continue the debate.