Bottom line is that net neutrality comes out of the desire for people to be able to access any site they want without penalties due to traffic shaping or other shenanigans.
The reason they are concerned is that the cable companies and to a lesser extent wireless and DSL companies are doing this.
And why do they have the power to do this? Why don't people just vote with their feet and switch to a competitor?
Because they are all monopolies.
Every cable company in every city I've lived in the USA has been a locally granted monopoly with the city extracting massive amounts of money from the monthly cable bill in "Franchise" fees.
Every provider of POTS service to your houses and apartments is a regulated monopoly. And while they have to let DSL companies access the lines and long distance competition, the barriers to entry are still there, and the level of regulation is stifling making it hard to compete.
Every wireless carrier is a monopoly-- because they all have monopoly powers over bands of spectrum the federal government sold to them. And while multiple bands were sold, only 3 max bands were sold for mobile in any metro area, reducing competition. (The government claimed that they had to reduce competition to boost the prices that the spectrum sold for-- probably true-- monopolies are very valuable!)
So, in response, these companies engage in rent seeking, to cover the massive taxes they pay to the federal government but also to maximize the value of the monopoly they paid so much to establish.
And as a result, people get mad at this rent seeking and demand net neutrality.
And what do they propose as a solution? Regulation! Treat it like a utility!
Well, I worked in the electric industry. Another utility that is highly regulated, engages in rent seeking and is, a monopoly over its area.
People pay way too much for electricity in this country as a result. And we have a poor service level-- like the brownouts in California a decade ago that were created when regulations made it illegal to both make and sell electricity, literally prohibiting the provisioning of additional supply. (which naturally the left decided to characterize as "de-regualtion". How making it illegal to provide electricity by regulation is "de-regulation" I'll never know.)
Seeing a lot of green accounts? probably people who know their karma will be killed for daring to speak out against the leftist desire to regulate everything, despite the fact that, once again, regulation is the cause of the problem. (I consider granting a monopoly and prohibiting competition to be "Regulation", though an extreme form of course.)
Nothing better exemplifies the old saying "Government is a disease masquerading as it's own cure" then the calls for more regulation to fix the problems of regulation.
Most people won't subject their karma to the onslaught of down votes that daring to take a non-leftist position results in on this site.
But sometimes you have to take a stand.
And really, it's just astounding that people talk about net neutrality and pretend like these aren't government granted monopolies. Such denial!