First of all it's not about Israel who gave Syria the green light to attack Baabda palace in 1990.
what happened in 13 October 1990 was that the U.S.A gave Syria the green light to attack Baabda palace because if you know the Syrian air fighters were not allowed to fly over the free area of Lebanon, and according to Pierre Raffoul in his book
"Aoun,The Awakening of Lebanon" on 12 October 1990 General Nadim Lteif told General Aoun that the Syrian Army is surrounding all the fronts, so General Aoun replied : if the Syrians didn't use the Air fighters we will not be defeated because we are in a defensive position and we know our land very well but if they did use the Air fighters it means that the U.S.A sold us to Syria ... and that's what happened
.
concerning the Israeli role i'll just post what Annahar newspaper published about 13 October 1990 :
13-10-1990 :
الطيران السوري يقصف المقر العسكري ومدرسة الجمهور والمعهد الأنطوني في بعبدا ثم يضرب قصر الشعب.الطيران السوري يقصف المناطق السكنية بينما كان هناك تحليق للطيران الإسرائيلي
that's what flamenguita and xcoder meant, it's not about Israel didn't protect us from Syria. it's about the Israeli-Syrian partnership
and Israel was from the begining against General Aoun and opposed him as a prime minister.
Regards.