There were tears of joy as some of the schoolgirls kidnapped in Nigeria by Boko Haram two-and-a-half years ago were reunited with their families. Nigeria’s government is vowing to rescue even more girls. But there are reports some might be unwilling to leave their captors. Experts say some of the girls may have been radicalized by the Islamic militant group. Others may be too fearful to return home because they married extremists and have had a child. Some of the girls have been shunned by their communities.