Israel developed their own Nuclear weapons, why should it surprise anyone that they could and WOULD develop what they needed to hit Iran.
Holding out on Israel only set them backfor a little while and they probabl;t spent more than they would have if the US had supplied it , but these people are in it for the long haul.
The only thing stopping peace in the mid east is the Muslim hatred of Israel.
I would say it’s more likely Israel stole or were given the secrets, rather than coming up with them on its own.
Someone smarter than I, once pointed out, very well.... That if radical Islam (Hamas, Hezz-b, AQ, etc) put down their weapons...there would be peace in the Middle East over night....If Israel put down their weapons...there would be genocide... With that said, Israel is not striking Iran without U.S. direct support....unless it goes nuclear.