"Reasonable" has nothing to do with this, and neither does 911 or the police. A property owner has a right under the non-aggression principle to defend his property. Our natural rights as human beings do not include aggressing on others' property. Bars have bouncers and, rightly, no one seems to care about their potential for violating anyone's civil liberties. That's because bouncers defend the bar from the bad element, right? Bouncers are private security. There is no difference here.
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