In each of these massacres, the scenario was similar. Palestinians react to some Israeli provocation and Israel uses the Palestinian reaction as an excuse to launch its attack. The use of provocations is a long standing Israeli tactic. For example, Moshe Dayan discussed the use of this tactic against the Syrians, claiming that at least 80% of the incidents with Syria under the armistice agreements were caused by Israeli provocations.
Israel claims that the goal of its attack is to stop rockets from being launched into Israel.