Is genetic risk aversion rational?

As the conflict rages, displacing hundreds of thousands, U.N. and Palestinian officials say some families have made a macabre calculation: to split up, with each group seeking refuge in different parts of Gaza. If one part of the family gets killed, others will live on to help the survivors and keep their dynasty alive.

But most families, officials say, still move together as a source of strength and comfort. Some are now living with other relatives, further increasing their familial size, while others have taken shelter in U.N.-run schools and other refuges.

From Sudarsan Raghavan, there is more here.  Note that if there is a “single (cost-adjusted) safest perceived place,” splitting up the family into two or more locations is increasing the net expected danger to some family members, without making any members safer.