People already can duel away to their hearts' content. We'll just arrest the winner for murder afterwards.

It's hard for me to understand why we should allow people who are willing to gun each other down in cold blood over mere insults or percieved lack of "respect" to wander around free. If their so-called honour is really that important to them it's hard to see why they should not be expected to bear a jail term in order to defend it.