Extremists always claim that they are the one implement the will of Allah when they misuse the power and spell the blood of the innocents. When they do this none of them truly read or understood the Commandment of the Prophet (PBUH) reported by  Buraida in which you read: “When the Messenger of Allah (PBUH), would appoint a commander over the army, he would personally enjoin him to fear Allah and to be good with the Muslims who were with him and even with his enemies. The Prophet would say: “When you besiege the people of a fortress and they appeal to you for protection in the name of Allah and His Prophet, do not give them protection in the name of Allah and His Prophet but rather give them protection in the name of you and your companions. Verily, for you to violate the protection of yourself and your companions is a lesser sin than to violate the protection of Allah and His Messenger. When you besiege the people of a fortress and they appeal for you to bring them out according to the rule of Allah, do not bring them out according to the rule of Allah but rather bring them out according to your ruling. Verily, you do not know if you will judge with the ruling of Allah concerning them or not”. (Ṣaḥih Muslim)