Libertarianism is about compliance with the Non-Aggression Principle, how does opposing arbitrary restrictions of the free movement of individuals violate the Non-Aggression Principle?
You have the right to restrict access to your own property, but you do not have the right to restrict access to that which you do not own.
And before someone says it, federal or state land does not belong to the government, and does not by extension belong to us because "we are the government".
Land claimed by government does not belong to it, just because a gang of thieves claims ownership of it, does not make it so.
In a free society, all property is private property and ONLY the owners of a property can decide who they want or do not want on their own property.
I can not decide who is allowed on your property, only you can.
Check out the Laissez-Faire Journal at LFJournal.com
"The State is a gang of thieves writ large." - Murray Rothbard