I gotta say, my understanding of MLism is pretty spotty, but a Lemmygrad user opposing the Jones Act seems really weird.
Anti-Jones arguments are generally just raw-freetradeism – advocating to remove protectionist regulations so businesses can off-shore (literally off shore) their shipping to cheaper foreign crews, with the (supposed) benefit being that they will save money and then pass the savings on to the consumer. Were you a big NAFTA fan as well?