In 2011, a Norwegian right-wing extremist killed 77 mostly young people in an attack on proponents of multiculturalism. A critical event of this magnitude is important in a nation’s collective memory. For young people’s political socialization and value orientation, it could be crucial. Adolescents’ memories and interpretations of terrorism are an understudied area. On the basis of different memory narratives among ethnic Norwegian adolescents, who were 13 or 14 in 2011, implications of the attacks, seen as a case of collective memory formation of terrorism, are discussed in terms of how young people remember and interpret the attacks and negotiate between competing narratives. Focus group interviews conducted in 2015–2016 with 18-year-olds showed a marked tension between support for democratic values and numerous references to individuals and organizations having critical views on immigration and diversity and the importance of active agents promoting the conflicting narratives.