1) I dont know you have to ask them
It’s fine for you not to know. Perhaps you should accept that if political enemies are all agreeing that this Iran agreement is terribly worse than no agreement, than your layman analysis based on being a news junkie doesn’t give you sufficient insight to disagree with national leaders in a state of ongoing mortal conflict.
The Israelis are virtually all saying that having no agreement would be better than this agreement and that this agreement puts Israel at great security risk.