Suppose in the future there emerge some technologies that are very dangerous and cheap.
One example is a technology that allows people to release a lot of energy at once; it emerges as a result of progress in building superconducting accumulators. And such accumulators are installed in every vehicle. Another technology makes it easy to make antimatter or a nuclear bomb. Still a third technology allows people to make a dangerous virus using just a home computer and a DNA printer. There is a lot of cheap energy available, stored and transmitted via public networks.
How can the government control the people so that there will be no terrorist attacks or evil-minded sociopaths that would desire to destroy humanity?
Will total mind control become inevitable? Or will private possession of anything more complex than a screwdriver be outlawed?