Yes , IS fighters are war criminal by the standards of UN. There is no doubt in it. But he was lecturing ISLAM and i just became a bit curious.
In fact, in my studies of Islam and my readings of the Holy Q'uran, I've identified some verses that remind us all (Al-Muslim and Al-Qitab) on proper treatment of each other, especially in regards to violent peoples,
- “Say : O ye that reject Faith! I worship not that which ye worship, Nor will ye worship that which I worship. And I will not worship that which ye have been wont to worship, Nor will ye worship that which I worship. To you be your Way, and to me mine. (The Noble Quran, 109:1-6)
- “But if the enemy incline towards peace, do thou (also) incline towards peace, and trust in God: for He is One that heareth and knoweth (all things). (The Noble Quran, 8:61)
- “If thou dost stretch thy hand against me, to slay me, it is not for me to stretch my hand against thee to slay thee: for I do fear God, the cherisher of the worlds. (The Noble Quran, 5:28)