I believe the correct answer is: moral panic.
Moral panic is the term used to describe an instance of public anxiety or alarm in response to a problem which occurs when large numbers of people become concerned, fearful, about some behavior that they believe threatens the morality of their society. Moral panic is often fuelled by rumors and can be dangerous when is over the proportions.
Therefore, the fear that some evil threatens the well-being of society grips a large number of people is moral panic. Moral panic is usually followed by hostility, and sometimes violence, is then directed toward those thought to be responsible.
The correct answer is fictive kin.
Fictive kin is a term used in Sociology to refer to family members who don't have blood ties or marriage ties. The reasons for choosing fictive kin could be religious rituals, closer friendships or other relationships that involve social and economic aspects. An example of fictive kin is adopted, children.
Nowadays, the Fictive kin's term has helped to analyze immigrant communities as well as foreign fighters. This term is also used in Anthropology. However, anthropologists consider that the relationships named as "kinship" could be based on aspects related to the fact of sharing residence, sharing economic relationships, or any kind of interaction rather than blood ties or marriage ties.