You don't do diplomacy with the threat of a gun pointed at your head. That's called capitulation. It may be hard for you to absorb; but have you considered that maybe, just maybe Israel and the U.S are the aggressors? Radical idea i know...Let me ask you two questions:
What has Lebanon gained by HA claiming they will destroy Israel?
What would Lebanon lose if HA stopped making such remarks and instead focused on international diplomacy?