By their nature accidents are unanticipated. As a general rule we do not proceed knowingly into certain doom. The proprietors of that BNB should surely be forgiven for making a terrible mistake, with no malice in their hearts. No one is born knowing how to run a hotel both safely and profitably (or even that they should be considering safety).<p>But that is precisely why we&#x27;ve placed barriers to entry for jobs that serve the public, to catch mistakes known to us collectively but perhaps not individually. You&#x27;re right that it is your own responsibility to verify that a given course of action is safe. But it is also your responsibility not to market defective products, and to educate your users about risks associated with your product. The latter can and should be enforced by society.