It was the incessant attempts by Israel to invade Lebanon and the inaction of the Lebanese government but I guess your answer responds to your underlying allegiances.

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gryzzly 5 hours ago | parent [-]

Israel invaded Lebanon for the same reason every time - to prevent attacks on civilians from Lebanese territory.

https://en.wikipedia.org/wiki/Palestinian_insurgency_in_Sout...

	▲	Daishiman 31 minutes ago \| parent [-]
		Because of the constant invasion and denial of recognition of the West Bank and Gaza as Palestinian and after decades of pogroms and ethnic cleansing of Palestinian villages.