The full answer will take some time to emerge. But it seems as if surprise, scale and speed overwhelmed defences which were patchy and unprepared for what they faced. Israeli intelligence failed to get inside the planning by Hamas for the attack. The group seems to have undertaken a long-term programme of deception to give the impression it was incapable or unwilling to launch an ambitious attack. Former US Army Lieutenant general Mark Schwartz who served as the US Security Coordinator for the Israel-Palestinian Authority until 2021 spoke to the BBC about how this possibly happened.
How did Israeli intelligence fail to stop Hamas’s major attack from Gaza? – BBC News
