"...murder still happens despite all our efforts to prevent it." Sure, but it happens more in some places than others. We can nudge people to situations where

"...murder still happens despite all our efforts to prevent it." Sure, but it happens more in some places than others. We can nudge people to situations where they are more likely to murder or we can take care of society and have fewer. Drugs aren't quite like murder, and laws regulating food additives aren't like drug or murder laws, and each of these have different impacts.