[Grunthor]

Israel has a right to defend itself. Lebanon has a right to shoot down anyone violating it’s airspace.

I have no quarrel with either nation defending itself.

[Netz]

This would be true IF...Lebanon was a country that had a grip on it's own sovereign territory. Who is defending Lebanese airspace? The Syrians, the Iranians, the Hizbollah, Walid Jumblatt and the Druze??? Who?
Since 1976 Lebanon does not control itself, only outside players and this is a tragedy. You statement would be true if Beirut was in control of all Lebanon and this is not and has not been the case for many years. All of southern Lebanon is Shiite controlled Hizbollah and Hariri, the new young Prime Minister lost his father to the Assads in Syria.
So, while the Israeli Defense Forces are defending their border a myriad of groups, factions, foreign run armies are running the show there. Who gives authorization to fire SAM missiles at Israeli aircraft?