Much of Netanyahu's speech was simply rhetoric, such as his comments regarding Iran 'gobbling' up other nations. As if many other nations aren't trying to spread their own zone of influence.
However, Iranian leaders have made several statements about destroying the Zionist regime. If someone wanted to purchase a weapon for the sole or primary purpose of killing your family, which they had made public, RubaDub, you would probably be trying to get someone's attention who could thwart the attempt.
Iranian leaders have made several statements about wiping the Israelis off the map. If you were the leader of Israel you would be doing the same thing.