Not all radicals set out to become radicals nor to become extremists. Yet, many become radicalized through a series of systematic events that are beyond their control and out of their cognitive abilities to decide differently.
Therefore, across Syria, Iraq, Nigeria and elsewhere, those who have become inevitably radicalized, are in dire need of mercy and of compassion because of the forced conditions of radicalization under which they have found themselves. Moreover, the determination that deems these individuals as radicals are not tagged by these folks themselves, but rather, they are branded by others foreign to the life experiences of each and every inevitably radicalized person.
So, considerable mercy and compassion should be extended to persons like the Syrian "extremists" who have lost entire families in five-years of war and whose pain and circumstances have led them to groups such as the Islamic State(IS). Also, due consideration should be given to kidnapped boys and girls who have been brainwashed by Boko Haram in Nigeria.
Each and every determined radicalized person should be accorded justice on a case by case basis with appropriate weight given to their life experiences and the existing fitting conditions that allowed for their easy radicalization. Humanity owes each person due process and mercy.