Comparing ISIS to the Nazis is not even a close comparison, as the Nazis had a strong army with military weapons. And ISIS dose not have the same military weapon capability, but has a way more bigger army on the ground as it could easily fend 200 million soldiers. Revelation 9 ring a bell !!!
The other thing I would mention is what they do is bad, but a Christians thought process should never be a put to death first mentality. Christians are told be the Lord to have love for all, including enemies. And love does not have a kill first approach. If we go in with an approach of defensive stance, and not kill first stance, then that is the proper way.
And please I would ask to those who want to keep bringing it up, leave the Democratic and Republican debate out of it. Because not all Democrats believe that way, and I also know some Republicans that do. Plus there has been just as many republicans who have been caught in dirty tactics just as there has been democrats.