No, I mean there could be some actual effect that selected for those people.
For example if rich people were culturally more likely to use heroin than poor people, then overdoses would lower the life expectancy more than you would expect, because rich people (when not overdosing on heroin) have better access to medical care and hence longer life expectancy.
For example if rich people were culturally more likely to use heroin than poor people, then overdoses would lower the life expectancy more than you would expect, because rich people (when not overdosing on heroin) have better access to medical care and hence longer life expectancy.