I’m a lot less worried about Iran getting nukes than I am about Pakistan already having them and therefore nukes being in the possible reach of stateless terrorists. The irrationality of the Iranian regime is greatly overrated. Even Khomeini himself knew when to call it quits in the war against Saddam’s Iraq.
You may not be worried about Iran getting nukes. However, whether they do or do not get them is in our vital interests.
Also, it is not in Israel's vital interest. Unless you are calling Netanyahu a liar, it will be perilous for them if Iran gets nukes...and what happens in Israel is our vital interest as well.