You really think Israel is concerned about being 'discredited' ?Iran is very smart in how they fight Israel through their proxies. Their proxies use human shields and Israel gets discredited for the death of innocent civilians.
All you have to do is take notice of all the protests here against Israel, to understand how successful the Iranians are with their strategy.
If Israel dare use a nuclear weapon, that would be the end of Israel. The entire world would turn against them. I believe they are smart enough to know that.
Today is the October 7th anniversary, and there are massive anti Israel protests in NY as I type this.
They are fighting for their own survival, surrounded by enemies that seek to destroy their Nation State.