This is one of those times.
The reason libertarianism is a political failure is because the main motivation for the “movement” is “I want what I want, and I want everyone to leave me alone”.
Political movements are built by selfless true believers who are willing to sacrifice to see it through. If the only reason you’re part of a movement is self-interest, the minute you face difficult opposition that requires much work to over come, the inconvenience of it offsets what you hoped to gain and you give up.