Why did Iran willingly disassemble their other WMD programs, like bioweapons and chemical weapons, if they are irrationally bound to destroying Israel?

Chemical weapons are perfectly effective for that desire and dramatically easier to build and deploy than nuclear weapons.

So if you expect Iran to just explode Israel ASAP, why are they holding back right now with their weapons not targeting civilian infrastructure? Why did they stop pursuing cheap WMDs that don't need complicated enrichment?

Note that Iran is objectively not pursuing a nuke as fast as possible. They've had sufficient enriched uranium for a long time to be able to actually start building and testing physics packages and even get their first detonation test, but they instead have just been building a stockpile.

>I'm not supportive of Israel having nuclear weapons

Okay, then by your arguments about Iran, we should be invading Israel right? Like right now! They cannot be allowed to have nukes!

What about North Korea? It sure is funny how all the hand wringing about them getting nuclear weapons got quiet after they built a nuke and didn't use it