>>518806870 (OP)
Because the government only covers around half of healthcare expenses so while it has a financial incentive to keep people healthy it doesn't have the leverage to pass unpopular laws and enforce it.
>"it's my body/my insurance payment/fuck you, etc."
Even something as innocuous as making soft drink cups at fast food restaurants smaller was hit was massive pushback. The vast majority of politicians don't care about helping people, they care about keeping their job and you do that by not making voters angry.