Gaza is a small place.
A terrorist could normally leave his residence and be in Israel in less than a half hour.
As for the Israeli wall (or fence), it could always easily be overcome.
The fault is that the Israeli villages and villagers lacked self-defense weapons.
I agree with the failure of citizens to be capable of self defense, Israel needs a 2nd ammendment, However:
We were promised by Bibi that a formal investigation into the failure of Israeli intelligence would be forthcoming. (And there was a failure of intelligence). But the resignation of the Intel chief does not preclude the promised investigation ,
I understand that the Israeli leadership (don’t know if it was Netenyahu or someone else in the command chain) allowed concentration of energy on the West Bank and this may have left the Gaza border in a weakened state. But this may be due to a diversion on the part of the Palestinians and incompetence on the part of Israel. And we should never underestimate the power of incompetence to explain failures of human systems. I will honor the resignation and await the investigation results.
And to make my position clear, the Palestinians started this thing, no matter how many years the back and forth persecution has been left to fester, Oct 7 was as worthy of retribution as Pearl Harbor and I realize that this leads to a desire for revenge forever. But sometimes you have stand up to bullies.