ICJ orders Israel to prevent genocide in Gaza, stops short of ordering ceasefire

Perhaps I am unlearned in this area but I am unclear why the Jewish state, after its people experienced the atrocities of World War II, would act in this manner toward the Palestinians. Can anyone shed light on this? I understand completely the need to rid the world of Hamas terrorists, but in the process they have shown a reckless disregard (to put it mildly) for Palestinian people and their wellbeing.

It's not about religion, it's about occupation. Zionists got permission to occupy the land from the British with The Balfour Declaration then started the invasion in full in 1948 with Nakba. When you occupy someone's land, there can never be peace until they get their land back or are fully exterminated or controlled militarily. This is why colonization most often leads to genocide or permanent apartheid.