"Offended" can be very subjective. If you identify with the people being killed by ISIS, then yeah you'll probably find it terrible what they're doing. Not to say that I don't, but if ISIS is seeking out those who are close to you, or in your community/religion, then you would definitely feel it on a more personal level.
Even though I have family in Jordan and Syria, I don't find the videos offensive, although I can bet it does offend my family near the affected areas. By playing a game, and having fun being a terrorist (doing beheadings and stuff), yes you will attract some unwanted attention, and I honestly think you deserve getting banned. I don't define having fun as role playing a terrorist and killing innocent people, but to each their own. This issue actually something I'd like to discuss with them next time I get the chance- thanks.
I voted no.