Remember that in the middle east, Iran is considered a dire enemy.
Their actions do not follow the conclusion you state.
What is clear now though to any Iranian is that they should get nuclear weapons asap. Diplomacy is just a tool used by the west to string you along while they get ready to bomb you
Of course, Iran very much wanted the ability to make a nuke, and they probably could have had one ready in 1 or 2 years. But the proof put forward in defense of this strike is claiming Iran was weeks away from nukes. That proof is dubious.
(Also interesting to consider how US retreat from the nuclear deal under Trump 1 has affected and shaped the current situation)
It's a dire enemy because they're Shia and the rest (with some exception in Eastern Saudi Arabia) are Sunni.
IAEA also confirmed that Iran didn't have ongoing military nuclear project.
The reason why they raised their enrichment level was to raise their bargaining power to force the US to come back to the negotiation table in an attempt to get rid of the sanctions.
They almost succeeded since US and Iran were supposed to meet last Sunday, but that was not taking Israel into account, which killed the chief negotiator and convinced Trump to bomb Iran just 3 days in the “two weeks” negotiation deadline he had set earlier this week.
But that doesn’t matter anymore