In the US, the value of someone's life depends on their citizenship, so they can perhaps get around this problem by only crewing their rocket with non-Americans.
Don't Americans die in coal mines? Don't Americans die on construction cites. Don't pilots die in air travel accidents?
Nobody said Americans don't die too, just that the US values American lives much above other human lives. For really obvious illustrations of this fact see for instance the Irak war (pick one), or migrant deaths along the US - Mexico border.