It [the Tea Party movement] didn't fizzle out because of a tendency towards apathy and the difficulty in sustaining a high level of outrage. It was hijacked by the right-wing social agenda crowd and they killed it.
That's as lame as Lefties' comments under the article about Diane Feinstein saying something stupid, where they blamed the Democrat party's failure to field a more tech savy candidate on the Republican party's unwillingness to field candidates closer to their side. You can't blame others for doing what you'd only expect them to do, acting in their own interests.
Social Conservatives saw anti-Left passion that they hadn't seen since the Christian Coalition days, so of course we'd want to latch onto that. I disagreed with my fellow Religious Righties on expanding the goals of the cause, and diluting the primary goal, as I thought for anything to have any chance of going anywhere it would be best to pursue a single interest at a time.
So I disagreed, but I'm also totally unsurprised. If the Tea Party movement had enough zeal on its own, it could've sustained itself to this day (because afterall nothing's gotten better) and it could've kept itself pure. But its people lost interest, in general; they all went back to their lives, having accomplished nothing. Just like the Occupy Wall Street people.
In short, there is no hijacking. If too many people flood your group with messages that distract from the original, then you didn't have enough people, dedicated enough, to the original message. Nothing stopped Libertarians from abandoning the watered-down groups and reformulating the pure ones again. Don't blame others for what you guys failed at.