Banning cars could save more lives - Does that mean we should ban cars?
What effects would that have on the economic productivity of the country ? In turn, how much poverty will that create ? How many extra people will die as a result of not affording medical care ?
And this is a simple utilitarian exercise where you compare lives lost with lives lost. What about more complex dilemmas (see title of post) ? Should a nation never send troops in any conflict and accept any onerous terms the adversary imposes, for the sake of preserving all lives ? Should we ban all individual choice and responsibility, ban all sugary drinks, impose a state-controlled healthy diet ?
The notion that "lives can be saved" is not and cannot be used as the sole deciding argument on a societal issue. We are free individuals, we associate in a community seeking to improve our perceived welfare - one cannot treat the welfare as a goal in itself segregated from what we as individuals want.