[knorby]

But StackOverflow sites allows deletion, at least in part, as the author points out. So it is fair to say they aren't really enforcing that notion either.

I don't think I'm necessarily hinting at a copyright issue, though I think some control over attribution is pretty fundamental to it, but the point I'm trying to make is that the right of attribution is a stronger one than SO's right to maintain high-quality content. There are a number of ways that right can be accommodated, and it is the job of the publisher to figure out how.