Why? Because the world, me included, have seen all the lies made by US in their atempts to start anpother war. They've done it over and over again the last 20 years. So no, i dont believe a single word comming from the US propaganda mashine, propaganda of war. Comparing Iran to US makes Iran way more creddible. Just by looking at their actions and comparing these two countries.
Motorcyclist in his 20s dies after crashing near Gedera (Haaretz)
from the article: Iran calls U.S. assassination charges 'Nazi propaganda'