Well, not literally, but one Matt Bruenig, who blogs at Demos, picked an intellectual fight with Sheldon Richman, alleging that the libertarian position against aggression is incoherent. Here is Richman’s rejoinder.

I simply can’t see why “progressives,” who want to coerce people into giving up lots of their liberty and property so that they, the progressives, can remake society to their liking, want to quibble with libertarians over the non-aggression principle.