Because the law requires it, and it requires it because people who can't drive can kill or harm themselves and people around them. If there was absolutely no ri

Because the law requires it, and it requires it because people who can't drive can kill or harm themselves and people around them. If there was absolutely no risk of harming or killing, the law would probably not require training before you can drive. If not being able to use a computer meant killing or harming people, the law would probably require training but because there is no such danger, no one cares and everyone can buy a computer and start using it with no training.