> Would the world be safer (or more endangered) if Iran had a nuclear weapon?
No.
> Not sure if North Korea is a good example
It's not in an instructive way. Iran has killed thousands of people outside its borders, directly (e.g. the AMIA bombing [1]) and through its proxies. If we exclude South Koreans, Pyongyang has killed maybe half a dozen people, and those were under Kim Il Sung (the Rangoon bombing in '83 and Korean Air Flight 858 in '87).
No.
> Not sure if North Korea is a good example
It's not in an instructive way. Iran has killed thousands of people outside its borders, directly (e.g. the AMIA bombing [1]) and through its proxies. If we exclude South Koreans, Pyongyang has killed maybe half a dozen people, and those were under Kim Il Sung (the Rangoon bombing in '83 and Korean Air Flight 858 in '87).
[1] https://en.wikipedia.org/wiki/AMIA_bombing