This is a continuously contested issue, which at present seems unlikely to be fully resolved.
Were the Sea-People Greek or made up of peoples from further afield (Sardinia, for example), part of general movement of people as a consequence of famine or climate change, from western Anatolia or the direct result of the breakdown of elite control of Eastern and Mycenaean societies, or of economic reasons we still cannot grasp? Were they immediately responsible for the re-organisation of states and political institutions that witnessed possible changes in Canaan and the rise of theocracies (Judah and Israel-ok more Judah)?