Radical Islam has become a top security threat in many countries. But why are young people attracted to it? That is a big question facing France, where authorities estimate nearly 1,500 people have left to join jihadist groups in the Middle East. A former Guantanamo Bay detainee may not have all the answers, but is on a campaign to change young minds. For VOA, Lisa Bryant reports from the central French town of Venissieux.