There's only a truth to the matter if you can get people to agree on a premise. Two libertarians who adopt the same premises can have a meaningful debate
This is the myth of the framework. See Popper's book by that name:
Besides the issue of whether productive debate is possible across frameworks, there is also your (possibly accidental) assertion that what premises people believe affects what statements about reality are true (beyond statements about who believes what). That's solipsism.
This is the myth of the framework. See Popper's book by that name:
http://www.amazon.com/Myth-Framework-Defence-Science-Rationa...
Besides the issue of whether productive debate is possible across frameworks, there is also your (possibly accidental) assertion that what premises people believe affects what statements about reality are true (beyond statements about who believes what). That's solipsism.