Without network neutrality, Tumblr could cut a deal with your ISP — let's say it's Comcast — and its blogs would load really quickly while that home server blog might take minutes to load pictures. It might not even load at all. You can see why people in the freedom-of-speech obsessed United States might not be happy with chucking network neutrality. It privileges some speech over others, based on financial resources.
At the same time, ISPs would love to end network neutrality because they want to charge more to major players like Netflix in order to support their streaming content. Now, it looks like the FCC is thinking seriously about letting ISPs have what they want.