I think it's more of the rhetoric then anything else. If Israel and sworn to wipe off a Muslim country off the map I'm sure there would have been some serious concern when they had gotten the weapon- just as if any Western country had done the same.
I agree and was not trying to equate Israel and Iran. I think a lot of Iranian (and other islamic states) rhetoric stems from them feeling misunderstood and unfairly treated by the western world. Israel's nuclear program is just as illegal as Iran's. They focus this resentment particularly on the U.S. as the pre-eminent western power. We really do need to communicate with these people though I appreciate that it is difficult to talk to someone who is holding a grenade and threatening to kill you!