Palestinian terrorism: institutional or random?

In contrast to national liberation movements, Palestinian terrorism has targeted--deliberately, institutionally and systematically--Arab and Israeli non-combatants, sometimes hitting combatants. Palestinian terrorism has haunted Arab societies in Jordan (especially during the 1968-1970 PLO terrorism), in Lebanon (particularly during the 1971-1982 civil wars), in Kuwait (during the 1990 invasion by Saddam Hussein), in Iraq (until 2002, serving as an arm of Saddam Hussein's ruthless domestic oppression), in Syria (until 2012, bolstering Assad's regime of horror) and currently in Egypt (collaborating with the Muslim Brotherhood terror organization). Pro-US Arab regimes consider Palestinian terrorism a clear and present, lethal threat, never fighting on behalf of Palestinians, sometimes dealing them severe military blows (e.g., 1970 Black September in Jordan) and expulsions (e.g., 300,000 expelled from Kuwait), showering them with rhetoric, but not resources.