I agree with you that neither Israel nor the USA nor any other countries can stop Iran forever in pursuing nuclear weapons if that is what they want to do. Best bet is to change their thinking by showing Iran how useless that goal is with a nuclear Israel to the West & a nuclear India to the East. Is it worth totally destroying Iran's already failing economy & infastructure so they can be in a situation of nuclear checkmate?
You need to first prove their nuclear program has been weaponized. So far, no one has submitted any evidence that has happened. And it's pretty irresponsible to act like they have, when you don't know. Especially, if you consider the possible consequences.
Do you realize, if there is an attack on Iran, that could result in an end to all life on planet earth. Because such an attack, would put us in a direct military confrontation with Russia. And if we face Russia, we also face China (because of their defense pact). And if we do face them, it won't be suicide bombers we have to worry about, it will be real bombers, with real WMD's that they can deliver to our shores in under 30 minutes. That's not some mythical threat like radical Islam, that's a real threat.
So until someone can pony up a smoking gun, Israel needs to shut it's ******* mouth!