We're also getting news (from videos from CNN) that Hamas was shooting at armed security at the rave and that people got caught in the crossfire. Seems they didn't adopt proper fire discipline rules when firing on hostiles in the presence of civilians, but they're not exactly a highly-trained professional army with pinpoint accurate munitions. Hamas also lacks proper combat training for how to deal with adrenal stress and adrenal dump after all clear hostiles have been eliminated.