If we're rational? 1%. We're not, so let's say more than that, but it certainly shouldn't be 10x. If you have the ability to replace a car that kills 2 people

If we're rational? 1%. We're not, so let's say more than that, but it certainly shouldn't be 10x. If you have the ability to replace a car that kills 2 people per 100,000 miles driven (not a real number, just an example) with a car that kills 1 person per 100,000 miles driven, and you don't do that, you're needlessly causing a bunch of people to die.