I'd argue that ISIS and the alt-reich come out of the same issues with modern life.  Both extreme ideologies are attractive to people, mainly young men (but also some young women), who are disengaged from society.  There is some legit reasons for this like the lack of jobs but many are just spoiled brats who think that the world owes them stuff like sex and money and fame.  They fall easy prey to ideologies that tell them that it is the fault of X group - Jews, Muslims, immigrants, women, infidels, etc. and if we just ostracized and got rid of X group, then they would get the stuff they deserve.  Scapegoating another group is much easier than recognizing what one needs to do to make one's own life better or realizing that life is sometimes really unfair.