Read a book where a totalitarian state took over and sterilized everyone with a family history of cancer or any other congenital disease which almost doubled the mean life expectancy of the species.
Col. Green did the same in TOS/ENT when he executed all the irradiated survivors/refugees of ww3.
And in the real world...
The Nazis had roving Trucks that offered free medical care to Jews in the late 30s, but what really happened was that al the patients received sterilizing doses of X-Rays.
Odds are ironically that the staff in all these trucks were also sterilized from constant incremental marginal exposure.