what's funnier is that they were also taunting the U.S. .. i'm not sure how smart they are strategically by taunting the U.S. while in the midst of conquering an area that the U.S. has a military history with.
It's not stupid, it's a political stunt, used everywhere, you call out someone stronger than you to show your followers that you fear nothing, not to mention that a lot of ISIS recruites were victims to US intervention directly or indirectly.
ISIS are worse than the Nazi's. As evil as the Nazi's were, they tried to cover-up their brutality but this lot seem to gloat in it. The world cannot stand back and let this group commit unspeakable crimes and grow in numbers. How they can do this in the name of Islam i don't know, they are savages, nothing more.
Nazis were on a class on their own, they used their advanced science and scientist to find new way to murder people, ISIS might get there if no intervention is made, but for now they brutal uneducated criminals in the vast majority, and what they are doing is against Islam and I can give examples, such as it's forbidden in Islam to kill or torture someone that surrendered, to kill unarmed women and children, slavery is also forbidden in Islam....ect ect.