Whether Iran is or is not trying to develop a nuclear weapon or weapons should not be an issue. There are countries, that have hundreds, even thousands of nuclear weapons and yet no one is talking about attacking them for it. Why should it be a crime for one country to possess, what others already have in abundance? If it is wrong for one to have them, it should be wrong for everyone.
Iran, just like any country is not perfect. It has it's shortcomings and needs to improve in other areas, just as every country. Are those who condemn Iran as evil every five minutes, better than Iran? Do they really care about the Iranian people or do they just care about owning and controlling what Iran has?
As for the argument that Iran, is a threat, how many countries has Iran attacked, invaded or occuppied, how many governments has Iran overthrown, how many heads of governments and others has Iran assasinated, how many military bases does Iran have on foreign soil, how many internal conflicts has Iran sponsored around the world, how many so-called enemies does Iran have in every part of the world, how many resources belonging to other people does Iran claim to be it's national interest or national security, how many innocent people in the world have died, been maimed, paralyzed, been raped, deranged and displaced because of Iran, how many secret prisons does Iran operate around the world, and how many countries are really worried, that Iran will invade or attack them some day?
And suppose we apply the very same questions, that we have asked of Iran to those accusing Iran?
In living memory, Iran did fight one war with it's neighbor Iraq, but that is because it was attacked. Back then, Iraq leader Saddam Hussein was America's servant and a 'good dictator', before he rebeled against America and became a 'bad dictator'. On America's behalf, Saddam attacked Iran, in order to punish Iran for overthrowing America's 'good dictator', the Shah and for daring to take Americans hostage, as payback for the Shah's murderous rule, supported by the USA.
Even if some day, Iran did acquire nuclear weapons, it will never attack the USA and it's allies, who collectively and individually have thousands of nuclear warheads. The only thing, nuclear weapons will do for Iran, is the same thing they have done for other countries, that have them and that is guarantee, that no one will ever attack Iran. Nuclear weapons for Iran, will guarantee that Iran's resources will always be owned and controlled by Iran and for the benefit of Iran. How many weak countries own and control their own resources, and do those resources benefit the countries or foreign corporations and governments?
There was a time, when the USA hated Russia and China to death and vice versa, but neither country dared attack the other, because they understood the grave consequences on both sides. In our life time, how many times have you seen countries that can fight back being attacked? And in your own neighborhood or community, what are the chances, that anyone will try to break into your house, if everyone knows you own a gun?