Israel overestimating themselves and underestimating the terrorists, was under the impression they were invulnerable being guarded by, among others 1. Iron Dome 2. vaunted security barrier which terrorists Hamas just breezed through.... 3. and lulled into a false sense of security [of deterrence]
Didn't Israel learn?! anything from The Godfather
if history has taught us anything -- women and children can be careless, but not men.