If Israel didn't give a flying hoot, they wouldn't be holding press conferences in front of the nations of the world justifying their position. They'd just do it, but that's not what they're doing here. Nations are always looking out for their own self-interests. That's a given, and there's nothing wrong with that. Where this strikes me as unusual though is how they're trying to build support for their position. The US always does this before major military action.
But of course, Israel has been denouncing Iranian actions for years. This is nothing new.