There was massive and repeated intelligence reports it was going to happen. The whole border has massive high fences with huge rolls of barbed wire and watch towers, and surveillance cameras everywhere, and very sophisticated military equipment, drones, etc- all along the border. It took quit a while for Hamas to destroy the fences with heavy machinery before getting through, and quite a significant distance to the kibbutz.
Why was the festival allowed to go ahead so close to a border which was threatened with multiple and repeated intelligence warnings?
Why were the perpetrators not spotted by the sophisticated surveillance equipment?
Why were the perpetrators not shot/bombed there and then by the very sophisticated military Israeli equipment.
WHY?