Oh! Gee - mistakes never happen, do they? OOOPPS!
Of course accidents happen. Risk has to be managed.
Risk = probability x magnitude.
In this case, the probability of a mistake can be mitigated to near zero and the magnitude is isolated to a single individual.
Will it happen? Maybe, somewhere, eventually. However, in that case, the argument becomes 10,000 lives saved, 1 lost.
Even airbags pose a risk and kill people, but the benefit of these by far outweighs the cost.