Well, the USA could be brought up as a parallel to Iran, due to the imprisonment of journalists and peace protesters, etc. But not only does the USA have very bad prison conditions on the mainland USA, it also has very bad conditions and ignores human rights in prisons around the world -even to having secret prisons.
Most policemen are stand-up fellows but the cruelty to the innocent, the disabled, the vulnerable, protesters, environmentalists and immigrants by many of the policemen & those enforcing "national security" does not follow any rule of human rights.
Certainly there is the question of whether or not the USA is a democracy. Most will be familiar with the shenanigans which placed Cheney & W. Bush in the White House. Recently there is the Supreme Court decision to recognize corporations as having the same rights as a citizen (a human being) under the law.
Iranians I have spoken with call their government a democracy. After questioning and discussion the parallel to the type of democracy with the USA is clear. Although the Iranians feel more positive about thier ability as voters to push towards a working democracy. In the USA the cynicism about the purpose of voting makes people far less hopeful about the shape of the USA's democracy.
As for the nuclear situation - clearly the USA has nuclear weapon capabilities whereas Iran doctors are desperate for the small amount of the substance they need for their hospitals.
It's important to realize the military superpower of world is often blaming Iran for exactly the things the military super power is doing without moral or ethical consideration.
When standing back and observing the situation as a global problem the problem of a possible preemptive strike on Iran looks quite differently; possible in a way more realistic to address and find a solution.