Iran IS threatening the US, but that's for another thread. And they have threatened multiple times to initiate force against their neighbors by blockading Hormuz, which is a total joke, but a threat none the less. Shutting down the straight would be preventing commerce to a bunch of nations that you have clearly illustrated in your picture.
The link I posted last was to an article that pointed out that Iran has been threatening genocide and nuclear holocaust on their official government websites. Their government officials have been giving speeches about this and their government news services promote racism and anti-Jewish propaganda to everyone, even including children's shows, for a long time.
Threatening initiation of force is a violation of the NAP. Destroying their weapons and weapons research facilities is reciprocation of force or threats of force and is perfectly justified.
On the good side, these actions seem to be the last thrashings of a dying dinosaur before it goes extinct. Stable societies and governments don't do this sort of thing. So hopefully we will see the end of the Supreme Leader Ayatollah Khamenei's dictatorial rule and puppet fascist President Mahmoud Ahmadinejad shortly.
I just hope no-one gets bit by the creature before it dies.