This is a somewhat complex question to answer, and one that can't truly be untangled from the broader history of the I/P conflict. But the base idea is this: you can't fight terrorism with bombs. Israel's stated goals in this war don't make sense: even if they could eliminate every single Hamas (military) operative, the kind of assault they are perpetrating is obviously going to give rise to a new wave of militants, probably much more embittered than Hamas is today.
So, Israel can only have two actual goals in this war: either they are seeking to purge Gaza of Palestinians, or they are seeking to punish Gazans in general for the actions of a few terrorists on October 7th, eye-for-an-eye style. There is no other reasonable interpretation of this war, and the vast majority of the world's countries see it this way (as seen by the overwhelming support for all pro-Gaza resolutions at the UN, typically 150+ to 10 or less).
Now, if Israel actually wanted to eliminate the terrorist leadership that perpetrated the October 7th attack while not creating new generations of terrorists, they would have gone about this intervention in a completely different way. They would have had to work with the non-militant parts of Hamas leadership and the PLO of the West Bank and with neighboring Arab countries to bring these murderers to justice, along with sending the equivalent of police forces for taregtted operations.
For an example of how this can work, you can look at how the UK dealt with the IRA in Northern Ireland, or Spain with the Basque Country separatists. They certainly didn't start bombing Belfast or Bilbao semi-indiscriminately to weed out the terrorists there.
Of course, what I'm saying is laughably far from anything that was actually possible to imagine as an Israeli response, given the long history of repression and mutual hatred of those territories. The reality is that Israeli leadership, and a sizeable segment of the Israeli population, wants the territory of Israel to include Gaza and the West Bank, but without bringing in the huge Arab Muslim population there as full citizens with equal rights in Israel. They also want to avoid creating explicit laws officially recognizing them as the second-class citizens that they are. So, the goal of Israeli leadership is actually maintaining the status quo: people in Gaza and the West Bank (and East Jerusalem) are living as second class citizens, their land is slowly being encroached by more radical coloniats, and their anger is controlled by bombings and deprivation when needed.