Why do you say that jet engines introduced safety? If anything, jet engines were very unsafe for a long time. I would argue better manufacturing, redundant part

Why do you say that jet engines introduced safety? If anything, jet engines were very unsafe for a long time. I would argue better manufacturing, redundant parts, better flight training, and quality assurance that led to the safety I expect when flying today. Every screw on a Boeing aircraft has a documented specification for the torque used to install it. That’s why I feel comfortable to fly as much as I do.