Also if people really cared about how long other people in their country lived, total cigarette ban would be a super simple and super cheap way to start [...] And trans fat ban [...]

The lack of these bans doesn't mean people don't really care about lifespan; it could just mean they value something else more, such as the autonomy represented by being able to smoke cigarettes or eat trans fats. Or (as implied by some of this comment's siblings) they don't think those measures work well enough to justify whatever the bans' anticipated downsides.