Earlier quoted context omitted.
I suspect you need such a carve out to be able to legally block denial-of-service attacks and other such network events that are intended to disrupt regular operation of a service.
That's what they'll swear to you, but of course the government will use it for censorship just like the FCC nowadays censors the TV and Radio. Read up the history of the FCC. At the time it was also "necessary" to regulate airwaves because of several noble reasons but of course what ends up happening is that now you have to get a license from the government to say something on radio waves. You will have to get a lice…
For radio, the broadcasting space is limited and multiple people broadcasting onto the same frequencies would ruin it for everyone. By your standard, why haven't they started censoring telephone conversations? The pressures that brought the FCC into putting those regulations in place just don't make sense for the internet.