Well, OK...if I buy a house knowing that that it has a gun-waving Libertarian lunatic inside, then I can't very well complain that the difference between that home and a theoretical, Libertarian-free home is "opportunity cost", and demand that the Libertarian be removed to maximize my profit.

The opportunity cost came when I bought the house, not when I realized that Libertarians are insane and unpleasant. That part is called "buyer's remorse".