I was under the impression that there was debate because people in general don't trust either big business or the government to police things properly.
That's basically it. It's just that the dittoheads think net neutrality = government policing when it's not. The telecoms have done a bangup job of misinforming the free market dogmatists on that matter.
Government mandated net neutrality is basically what most of the debate is about. I don't see much of the net neutrality debate framed outside of whether or not the government should enact regulation.