We still have guns and knives and nail guns and even cars. They automate something, but also have potential to injure and kill. You just weigh the pros and cons. You don't just not do something because there's a risk of death. Cars are basically metal coffins. Just don't drive when drunk, etc? Basic competence and operational safety and responsibility? If cruise control made you free from blame everyone would just be driving drunk off their ass with cruise control on. How is that more thought out?