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> I just can't understand why people ship things that fail into in potentially dangerous states on some known non-trivial fraction of inputs

Because that kind of safety-conscious culture needs to be deliberately enforced, from the top all the way down, by a system that takes a long view.

If we're making an analogy to the defense industry, then building self-driving cars as a tech startup is closer to the Anarchist's Cookbook than Northrop Grumman.

Because the penalties and rewards don’t align.

Because you don't want to be the one whose team is lacking in agility on the next company all-hands meeting ;)