The usual hack for dealing with this is to require liability insurance. The insurer has incentives to set premiums at a level that reflect risk, along with reas

The usual hack for dealing with this is to require liability insurance. The insurer has incentives to set premiums at a level that reflect risk, along with reasonable contract conditions -- e.g. "Put guards on all your rotary saws, and yes we will be sending inspectors in to make sure they're being used properly." (How is this different from an ordinary procedural regulator? Because the insurance market has competition, which means that the insurance companies aren't only trying to optimize for reducing risk -- they're trying to reduce risk efficiently. And if they're not very good at it, they can be outcompeted by someone who is.)