I was a card carrying Libertarian

 I was a card carrying Libertarian at some point in my late teens/early twenties.

While I still value things I learned from that phase (e.g. law is inherently an initiation of force), I now find some libertarian ideals to be like the simplistic Newtonian physics models I was presented with at first in High School. Beautifully elegant and self consistent but lacking in many real world practicalities like friction, and such.

I now find some libertarian ideals to depend too much on the hypothetical existence of ideal libertarians. This does not mesh with my real anecdotal boots-on-the-ground experience with humanity. Nor does much of it fit with modern scientific understandings (socio-psych-neuro) of human responses and motivations.

No matter how beautiful, logical, and robust a rational proof may be. It comes tumbling down if it's discovered to be built upon false prepositions. Upon flawed suppositions about human social primates.

I may be a Vulcan hybrid myself, but I am no longer so naive as to expect everyone else to think/behave like one.