It's quite clear that you don't understand Islam. Neither do I, I'm an atheist.Answer: Any attack on Europe would have to be viewed through the prism of Islam. And I cannot understand Islam and its goals of converting non-believers to Islam via the sword. But Islam drives all decisions for Iran and cannot be understood by a non-Islamic person.
Are the Iranians pragmatic? I cannot say.
The Qu'ran is opposed to forced conversion, unlike Christianity ( remember the conversion of the Saxons by Charlemagne, when many who resisted were killed, some after being baptized ) or apparently Buddhism ( most Tibetans were converted by their King at the same time Charlemagne was evangelising among the Saxons ).
Is the fact that you don't understand people enough reason to think they're idiots?
Iran has not attacked any country since 1979, unlike the US and Israel and many other Western countries. They are accused of terrorism, but the only thing that can be proved "against" them is their support for Hezbollah and Hamas. It sees these movement as defending themselves and their people against the aggressor state Israel. You might disagree but this is a defensible point of view.
Iran is enriching uranium it says for peaceful purposes and warlike intent has not been proved against them. But ending enrichment and giving in to blackmail might encourage the blackmailers. At the same time it says developing nuclear weapons is haram and that too is a reasonable point of view. Beside it sees that Iraq was able to remove the occupation forces and it expects Afghanistan also to be successful.
Iran is arming itself to deter aggressors and it keeps to the rules. Both are duties of a state. So where do you see Iran being unreasonable