Summary - in case you don't have 9 minutes to watch the video. You should let your kids play with fire, use sharp knives, throw spears, take apart appliances and drive a car. This gives them a chance to learn how things work and how to use them safely.
Children raised in an over-protective hyper-safe environment have no chance to learn self-protection skills - increasing their chance of being seriously injured when they encounter potentially dangerous things outside the home, or growing up to be overly cautious fearful adults.