The “track record” says the exact opposite. Israel has had to withstand the onslaught from its offensive neighbors who have been trying to destroy it from day one.
Israel has nukes for about 30 years, but has never used them. There is a very little chance it ever will. The strength of Israeli nukes is not in actually using them, but in the deterrence, which the possibility of using them provides. Once the weapon is used, the deterrence effect is gone. So, Israel will never use the nukes unless the only other alternative is eminent annihilation.
Regarding Iran and the “grave danger” they face from Israel, don’t make me laugh. In what way Israel can possibly gravely endanger Iran?
Besides, have Israel ever threaten to destroy Iran, wipe it of the map? Or any other state for that matter? Never. Yet, we hear on daily bases statements from Iran that Israel must be and will be destroyed. BTW, this very sentiment is expressed over and over again on this very forum.