My understanding is that net-neutrality is only enforceable via government regulation. Meaning, that without the government mandating neutrality, the corporations would be free to break neutrality.
As is usual, to provide freedom to one group, one must limit the freedoms of another, and we usually use government to do that.
I agree with this sentiment, but have some reservations about government ability to maintain neutrality. As things are, government doesn't understand how the technology works, and are ill equipped to regulate something they know so little about.
The government doesn't know about anything in that sense. They rely on everyone else to make a stink. We decry lobbyists, but the EFF is a lobbying organization. Joining them helps to pass the legislation. Nothing could help them understand it.
While ISPs can stiff their customers, they have the option of switching. There is no escaping from legislation, however.
If there is a doctrine of "no regulation/no legislation", corporations would have less of an incentive to mess with the political process (less rent-seeking behavior).
Net neutrality, while ostensibly a pro-consumer piece of legislation, nonetheless opens the door for future regulation (and yes, of censorship) of this space.
As is usual, to provide freedom to one group, one must limit the freedoms of another, and we usually use government to do that.