I think you've got to the nub of it. I worry about e.g. gall stones risk in 10y. But, friends worry it shows a lack of moral fibre or something. They aren't the same kind of worry. One is paranoia about past drug emerging issues and the other is tied up in belief eg poor addicts own their own fate, fat people should htf and eat less, depression isn't real... it's usually a short path to "I don't want to have socialised medicine for poor and old people"