Re: More engines!=more safety
The point here is that more engines may mean more failures, but it also mitigates the cost of those failures. With 31 engines, loss of one or two or a few of them should not lead to loss of vehicle, crew and passengers. It's good that an aeroplane can fly on one of its two engines, but even if it loses both, it can glide to a crash-landing and most humans aboard will survive. Not so with a rocket.