Because of literally years of terrorist acts from Hamas? Because the action initially had overwhelming public support? Because, as any military action without proper planning, they promised a quick victory and had no plans beyond "bomb, bomb, bomb"? And had no plans for "what do we do if we don't succeed"?

For an exactly same "military action with no planning but a lot of bravado" scenario see Russia's invasion into Ukraine.

Consider the possibility that “bomb bomb bomb” was the entire and only point of the exercise.

The correct answer is: because the Biden administration told them there were no red lines. Israel is completely dependent on the US, Reagan picked up the phone and got them to stop bombing Lebanon in 1982. As Israel continued to ramp up the atrocities, they discovered that nothing would cause them to lose patronage from the US.

Because there were children to starve. Brown children.

More than half of the Israeli Jews are "brown people" from the neighboring Arab countries.