The reasons why Iran shouldnt possess nukes are evident as: 1- It will definitely use them agains Israel, most probably unilaterally because of its age old desire to wipe off Israel. 2- It will effect the balance of power in the whole Middle East and South Asia. Why Iranian regime must be put to an end: 1- First of all, it is suppressing its own citizens with people being brutally murdered under Islamic law, in so many cases without fair or complete trials. 2- Second, the religious fanatics dont have any significant opposition and seem destined to acquire nukes. Israel is Not a nuclear threat as its history proves that Israel never used nukes in the past, not even threatened anyone. I believe that the world powers are going to come up with a very interesting solution for Iran; either diplomatic or military even if it takes some time. There is no possibility that the dreams of Iranian regime would come to fruition. To me, the ball never has been in the Iranian side.
U.S.-led coalition conducts 14 airstrikes against ISIS targets in Iraq, Syria (Reuters)
from the article: Ahmadinejad awaits a response