You're missing my point. Israel has the power advantage. They have a first-world military. If they were set on maximising killing in Palestine, things would look nothing like what we see today.
This isn't true of Hamas, who are quite clear about the matter: they want to bring about another holocaust. The only thing holding them back is that they don't have the might to pull it off.
Imagine what would happen if the power-balance were reversed. Very different situation, and very telling as to who has the moral high-ground.