SuperSonicSound
Shadowmancer of the Shadow Cabal
So while there will inevitably be casualties because there's very few entirely safe roads in the setting, the main factor isn't deaths, it's the expenditure of money and resources and influence it will take to replace the near-frictionless wind-powered free energy machines that we call 'ships' with muscle power.
The trade option doesn't cost lives it costs money, money that could in theory be used to fund other projects. Except dwarven gold often sits in a vault doing sweet fuck all any way *shrug*