In the US, 11 deaths per billion miles driven (or about 47k per year) is currently seen as an OK cost.
More than twice as much per mile as places like Sweden and Switzerland, and still substantially more than places like Canada, Australia or Germany (all three in the 6-8 deaths per billion miles range). So it's not like there isn't room to improve. The effort to do so just isn't seen as worth the cost at the societal or government level
Turning that into a monetary cost would change the ethics slightly, but it wouldn't be a monumental shift
More than twice as much per mile as places like Sweden and Switzerland, and still substantially more than places like Canada, Australia or Germany (all three in the 6-8 deaths per billion miles range). So it's not like there isn't room to improve. The effort to do so just isn't seen as worth the cost at the societal or government level
Turning that into a monetary cost would change the ethics slightly, but it wouldn't be a monumental shift