Yeeeah religious extremism particularly of the Muslim variety is a threat but an inflated one. A handful of dogmatic gorillas overseas is not a huge threat to the US or any first world country for that matter, sure they can kidnapp and kill people or blow up or shoot up a public place but they lacked the means to do any serious damage. Honestly I don't even know why North Korea is on up there. No usually a country's greatest threat to it's own success is it's own people or the leaders they put in power. I personally believe all the candidates suck but Bernie Sanders is the only one with the potential to do any real permanent damage so for that reason I will vehemently Support anyone running against him if he gets a nomination.