You're suggesting that honest countries with no intention of building nuclear weapons would have no reason to ever try and hide or protect their nuclear sites. This is probably the single worst point in history to make that argument.
I don't know that it can be confirmed, but Iran is claiming that the US tipped them off. This is a fairly standard tactic, and it makes more sense here. This is something that would satisfy both the pro-war crowd and the group that is pro-Israel or anti-Iran, but not necessarily pro-war. We get to show our strength and support for our allies without really committing.