A Double Edged razor - also called *Safety Razor* - is a tool that is pretty safe, and requires a few minutes (few shaves) to get the hang of it and virtually almost never cut yourself again.

You do not need to travel with exposed blades, you can remove the blades, and probably buy new blades for a few cents at the destination.

Making things superficially safer at the cost of wasting resources the future generations will need greatly to save 5 minutes of training and practice is the typical problem of our age. As the author pointed out, this trend applies to many parts of our lives with slight differences.