>Frankly speaking, I don't like it at all. I can live with an idea that someone can delete my messages or delete my account, whatever. However, the mere possibility that someone can edit my messages make me sick. I strongly believe that it's a bad feature.

No one is editting your messages. But if I see mismatched PRE tags, I fix the message. Otherwise it's very hard to read.

But yes, power in evil hands can do bad things.