Exactly.

Which, when you think about it, shows that the 'Iran cannot have a nuclear bomb' argument for this war is not exactly the true motivation (not to say that the US and Israel really don't want them to have a bomb).

This war is about trashing Iran. Adding it to the string of other failed states in the area. It would be more honest for Trump and Netanyahu to say that the motivation for this war is to ensure that Iran becomes a state that is incapable of developing the bomb (i.e. a failed and fractured, or weak and compliant).

Besides, nuclear weapons are- if usable at all- a defensive weapon. The claim that Iran would attack Israel with nuclear weapons is primarily meant to suggest that they're crazy fanatics blinded by such a hatred that they would be happy to destroy themselves together with their enemy.

On the other hand, I'm not exactly sure why Iran doesn't give up all its nuclear capabilities. It would cost them nothing except pride, and would remove any excuse from the table for the US and Israel for their aggression and sanctions.