True. There's no need.
But, we have an Infractions system. I really don't know how it is set up, but from what I've seen in some other forums, it works like this:
For each infraction you get a number of points (variable) and when those point reach a certain limit you get a penalty like not being able no post in some forums, not being able to visit some forums, not being able to post at all... etc.
It's the little flashlight next to "Report Post" and "View IP".