People posting in a public forum and not exactly sticking to the original intention of the original post? If that bothered me then there would be a problem with half the topics in the forum and almost every topic that gets over a page of posts.
The only possible way your idea of a topic could work is if all posts required moderator approval, and people could moderate their own topics. Of course you have never, ever posted in a topic yourself in a manner not specifically prescribed by the original poster...
I have no idea what you are talking about with other forums or deleting posts after the fact.
