I wouldnt generally either, but there are still limits. And starting the Irani-Israel war over the possibility of using nukes, with the strength outlined in the Jerusalem Post paper, are still transgressing the limits. Even if we would love it see it happen. I suspect that Israel can do it only if they obtain irrefutable proof that Iran intends to launch those nukes at Israel cities and is getting ready to do it.
When they hit Osirak in the 80s and the Syrian facility a couple years ago, they weren't waiting around for the nukes to be deployable. They also didn't care what anyone else thought about it.