It's simply not true. PLO was invited in the Lebadon by their official government, according Cairo 1969 and Melkart 1973 agreements. They didn't proclaim independence and it was the territory of Lebadon. And it was Israel, who committed the act of illegal aggression in 1982 and organised acts of genocide (like Massacre in Sabra and Shatila) in Southern Lebadon.
And Hezbollah raised from the local national resistance (with some support of foreign forces) after Israel invasion and illegal occupation.
Depends by what angle do you look. In fact, comparing with other countries of Middle East, Europe and America, Iran is just an innocent lamb, who never committed open and illegal acts of unprovoked aggressions. While America, Europe, Israel, and Arab states committed many.