They had prior knowledge, they took 2 hours to respond to a max 45 min trip, they moved the location of the concert closer to the attack zone a day before Oct 7th, they extended the festival an extra day so it would still be going on when Oct 7th rolled around, then they didn't tell the security forces any of this, nor what to expect.  Also, Netanyahu was on his way out prior to Oct 7th, so he needed a war to distract the avg.  Israeli voter.  Then, the IDF killed its own people during the fire fight.