I agree that we should all be civil and get along, and that everyone should know how to behave.
Unfortunately, that isn't always the case and measures like this are sometime necessary. Hopefully we won't ever have to use it, and options to remove users' ability to use the forums are always available if we need them, but this provides a clear-cut deferral and detention system for the moderators and administrators to utilize as they need, in addition to the usual avenues of approach.