Although it might reflect actual considerations of Israel and, by extension, the US, that's ultimately a very unreasonable take. Iran might not have been trying to build nuclear weapons in the past, as they claimed. Maybe they did, maybe they didn't. In contrast, Iran will try to build nuclear weapons in the future with certainty. They'd be insane not to try now, after having been bombed for weeks in an illegal war of aggression against them and having been threatened with massive war crimes and genocide.