Let me start off by saying that Hamas deserved more condemnation that it gets.
But if you want to know just how deeply Israel has been carrying out Ethnic Cleansing, I recommend you read "The Ethnic Cleansing of Palestine" by Iian Pappe,
Since the Holocaust, it has become difficult to hide large scale crimes against humanity. Modern day media being what it is. The Holocaust was to a large extent out of sight until it was too late.
However, Iian Pappe unravels the documentation of when another such humanitarian catastrophe occurred - the ethnic cleansing of Palestine, that began even before the Palestinian mandate in 1948.
Pappe is an Israeli historian that that has who has pieced together the documentation of an ethnic cleansing that began long ago, and Israel does not like to talk about.
Even today Netanyahu denies any genocide of Palestinians - even today under the watchful eyes of the world. But this is not anything new. Peppe uncovers documentation that is even more excruciating than today's slaughter in Gaza.
His book is unpleasant to read, buy necessary to understand the historical context of today - in the present day conflict by the settlers state of Israel.
Well documented evidence of intentional acts of murder, rape, burning of homes, targeted attacks aimed at moving Palestinian people out of the region. These actions were very successful in cleansing the area of Palestinians on a large scale,
What's happening today in Gaza is not happening in a vacuum. The relationship that Israel has with Palestinians has long been one of ethnic cleansing, and apartheid.