...

In other words, you reasoning is quite flawed the way I see it, and blocking DoS is indeed legitimate and legally supportable. Excesses are rarely protected by any legal statutes.

To the extent a customer attacks or defrauds the carrier itself,

protection

measures are allowed. But you cannot "protect" the public at large without a court order to do so.

I think that's what I said. "excesses are rarely protected by any legal statutes." Any response must be measured by a given cause. ***** "The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential, proprietary, and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and delete the material from all computers."