Israel didn't really change their position much. Iran was already funding all their enemies.

I suspect (know way to know) Isreal would have been better off attacking Iran alone - they could have sent a message "back off - we can do more harm to you than you can do to us", but sending that message is hard. They tried to send a clearer bigger message, but the problem is the message getting through ended up being "this is the worst that you will do to us and we can endure". The reality is Iran knows the US and Israel won't invade, and so long as that option is off the table Iran can do anything it wants knowing things won't get worse.

Compare to how Bush handled Iraq - months of convincing the world to help him invade (not always successfully, but enough that many people were sending troops). If conditions were sent such that troops really were on the table I would expect Iran to back down (I give it about 60% odds, which means 40% an invasion happens!). Israel would have won in that case, but it wasn't handled like that (there are reasonable odds that the US would refuse the propaganda to invade if that was tried though which means Israel would be back to the previous status quo...).

You probably have to read that last paragraph a dozen times to understand it. I'm not the best writer and it is a complex subject.