Just curious: do you believe in net neutrality? (I think that's the cause of my conflation with "common carrier"). But if censorship is a valid reason to deny service, why can't charter or AT&T say "we dont like what you're sending over our wires, so we're blocking or throttling you" ?

Is it merely the fact that encryption blocks the carrier from knowing what the line is used for? Or said another way, should AT&T have the right to terminate a user's service if they were certain a user was posting, say, white supremacy?