A good friend of mine was challenged to a duel once. He (a historian) worked as a (US) Civil War battlefield guide, and was confronted by an angry southerner. He was peeved with the perceived "anti-Confederacy" slant of his museum's material. "The war was not about slavery," he argued. "It was about state's rights." It's a common argument, and if you spend enough time in areas of the country especially relevant to the Civil War, you hear it all the damn time. It's technically true, in fact, but the state right principally in dispute was, in fact, SLAVERY, so the argument falls flat pretty quickly when it comes up against someone who actually knows the material.
But this guy was not having it, and ultimately challenged my friend to a pistol duel right there in the museum. We are not time travelers. This happened in 2007. We ultimately got security to escort the man out, stopping short of calling the police because this fellow seemed crazy enough to start shooting if he thought "the man" was actually out to get him, and that if he's challenging people to pistol duels, he's probably a pretty good shot.
So, no, I'm not for legalizing dueling. It validates the perspectives of crazy people.