Also, for those small cases, why not put responsibility (for any harm) more directly into both the customers and producers? For example, if a producer of a new low-volume product somehow manages to get a lot of waste packaging into the environment, they could be held responsible and pay a fee, or probably who discarded was the consumer, so the consumer in this case should be held responsible. I get that large corporations should be held to higher standards, and take stronger preemptive measures and follow stricter compliance rules.
I think the same should apply for all sorts of regulations, like electrical safety, radio emissions, etc.. If you're designing and selling a small product, you can and should take responsibility for what happens to it (in the case it is found your device bad design/construction itself caused injury, of course). Maybe the only thing you should be obliged to do was put a large sticker like 'WARNING: Prototype-class device. By opening you accept some RISK OF INJURY from device. Return to source if terms not accepted: (...)' -- that is, both you and the consumer should share some responsibility for trying something experimental.
Probably the overwhelming majority are completely harmless low-voltage devices.
In general, I think outcome-based and performance-oriented regulation is something that should be more widespread. Like, there should be in the worst case two options: (1) You follow a strict set of rules and guidelines that dictate how companies in your industry type should operate (specially important for high-risk stuff like nuclear plants, large civilian housing buildings, etc.); (2) You (instead) take increased resposibility for outcomes of your activity (products, devices, etc.), being liable for any damage at an increased rate.