I still don't buy the slippery slope argument. Net neutrality does not lead to fairness doctrine. The ability of the government to implement a fairness doctrine was established long before, and separately from, the net neutrality enforcement issue. They don't need net neutrality in place to help establish a fairness doctrine. There's no slope to be slippery.
In addition, people are worried over the precedent of net neutrality establishing control over the telcos. Sorry to tell you, but that precedent has been there for a very long time. Not only that, but fairness doctrine is about control over the content producers, not the telcos, so any net neutrality precedent is in the wrong place to be part of a slippery slope.
You don't have to. It's still a fact.