And I guess thats the end of that. i suspect you are conflating the Libertarian party with libertarians. But you didn't do that for the left or right.

Unlike the Libertarian party, true free market ideologues are open border.

http://openborderscomic.com/

or at least that borders are not a federal issue.

https://mises.org/power-market/feds-sue-texas-over-border-control-de-federalize-border

Does a true free market position really sound isolationist to you?

https://openborders.info/self-ownership-versus-state-ownership/

Isolationism requires imaginary lines on the ground to decide who is in or who is out. This is not a libertarian position. It's not a free market position, but it IS an authoritarian position.