So it's OK to initiate force to "protect" what's ours without waiting for a first strike from our enemies according to Libertarian philosophy?
No it's not OK. In the case of the Temple it was God's house that was invaded by scoundrels. It was the scoundrels that perpetrated the rights violation. Jesus said they had turned His house into a den of thieves. It was a proper display of anger and use of force. God is not a pacifist and He did not teach pacifism.