They have always been the libertine party, they never changed, yet to defend them people keep claiming they changed at some point, which they didn’t.
I grant there was always a “I-want-to-do-what-want-to-do!-What-consequences?” element in the party. In the past they were always balanced out by the Von Mises wing. Of course, the Von Mises wing never seemed to recognize that, that wing was holding them back; damaging their economic arguments by association.
The other problem is Libertarianism always assumes people are rational actors. They’re not!