ISIS and the new culture of terrorism

Just before few days, I watched a video where two Germans are debating if ISIS extracts its terrorist violent practices from Islamic teachings. I will not talk about this debate as there have been many publications and literature that discussed this concept from different perspectives. The thing that I would like to discuss is that culture of tolerance with this new established terrorist movement reflected by the absence of Islamic republic action that was highlighted by one of the debaters in the video I have watched. Before this, I would like to know your own perspectives about this idea, and then I will be able to develop my new article to be publish in a week.