Because we are civilized, and we shouldn't break peace agreements we have voluntarily made, unless our enemy does so.
Yes, it does appear that the 'leaders' of Iran intend the funeral as an insult to us.
They want us to break the peace so they can claim to be superior.
It is a propaganda move.
It is obvious to most people and we should be smart enough not to respond to it with foolish anger.
We will respond at a time of our choice, not the time of the enemy.
If the 'leaders' of Iran want their assets that we control to be released,
insulting us will do the opposite.
String the enemy along until the midterms have been won, and then the foot can fall.

Hear! Hear! Blow them all to hell!
That strikes me dino as a deliberate insult.
Should they deny it, I would not trust those stalling, lying barbarous religious fanatics as far as I could throw them all stacked together.

It will be a good time when we can respond like Howard Roark, "I don't think of you." Right now, the Iranians are like an annoying mosquito. They have a low probability of a both a minor annoyance and perhaps even death if they carry a life-threatening disease. Swatting them often is a waste of time, but a successful swat can be rewarding.

Love the idea, wish that they had. Maybe even put some pork based chemicals in there to make it burn red, white and blue!

Tag 'em now, swat 'em later? We'll see.