So you think "Death to America" and "Death to terrorists and evil" are the same? Do you think saying "criminals should be punished" is similarly wrong to say? Honest question, as I'm confused about your moral boundaries.
"Terrorism" is inherently a subjective, ideological label, just a vaguely threatening name for the Big Other. A classic in the genre, along with "Red Menace", "Yellow Peril", "Rogue State" etc etc.
The Iranian version of this propaganda technique is the "Great Satan".
They're all just big scary terms to throw around and justify ones deeds.
To the Iranians, the Americans are the terrorists blowing up their bridges. Now what?
Fair enough. If you think terrorist and satan have equal grounding in reality then we'll just have to chalk the disagreement up to a difference in priors.