@Thanh_Le

So we can not use violence to enforce border laws because that would violate the non aggression principle and we are just going to have to let in people who do not intend to live according to the non aggression principle

So we can not have a society or community based on the non aggression principle if we do not keep people out who do not intend to keep it

A bunch of libertarians are wrong because they are open borders since they claim borders violate the non aggression principle