The paranoia about Iran and North Korea is absurd and overblown beyond all proportion. The wars in which both nations have been involved in modern history have been local affairs, against their neighbors; Iraq in the 1980s and South Korea in the 1950s respectively. In Iran's case, they were attacked by US ally Iraq. Neither Iran nor NK have a current intent, or a past track record of far-reaching imperialism accompanied by wanton violence, and neither have the means to even fantasize along those lines, let alone accomplish such. The temptation for NK to develop nuclear weapons, and the possibility that Iran might want to follow suit, is to lessen the chances of being attacked, end of story. The US (and allies) have a track record of initiating dozens of wars in recent decades.. this cannot be denied.. and it is difficult or impossible to rationalize "national security" as a reason for any of them.
The likelihood of Iran attacking a European country, or the United States, is as far fetched as aliens landing on the W.H. lawn. The possibility of the US, or Israel, (or a US led coalition) attacking Iran is very real however, and the neocons have been itching for such a conflict since 1999. We're addicted to making war, but we are in denial about it.