I believe in those gated communities, the streets and most public works are paid for and maintained by the property owners themselves rather than the municipality, so that anything within the gates is considered private property. Still, the road in front of their house is not "their" property and unless the protesters were threatening to come into their home then I don't believe the couple had the right to threaten the protesters by brandishing weapons. The couple was right that the protesters had no right to be there, they just handled it very poorly and should have left it up to the authorities. If the protesters were, in fact threatening them and carrying weapons then they should have been smart enough to provide some evidence of that.