> inherently dangerous things can be made relatively safe with enough systems around them: roads, signs, traffic laws, licenses, seatbelts, and so on. While th

> inherently dangerous things can be made relatively safe with enough systems around them: roads, signs, traffic laws, licenses, seatbelts, and so on. While this is true, the issue is that what is required for "enough" can vary very widely. In particular, what would be "enough" for jetpacks (and flying machines more generally) is a lot more than what experience has shown to be "enough" for cars. Some indications of why that is are the frequency of airplane accidents involving experienced pilots, who have had a lot more training on how to fly a plane than anyone gets on how to drive a car, and also the amount of time and effort and the level of continuing human supervision required to keep commercial air travel as safe as it is, even though that also involves experienced pilots and has the support of many complex systems.