Yes, Iran's totalitarian leadership is a threat to its neighbors, particularly Israel.
(A ground war between Israel and Iran is a practical impossibility, by the way - neither country has the strategic reach for that).
According to their experts, a nuclear Iran is a good idea.
http://en.wikipedia.org/wiki/File:Shah_of_Iran_building_two_...
Besides that, that Iran doesn't exist anymore.
It will run out, though. The only questions are when, and what the contingencies will be once it does.