Because this is part of their campaign of systematic extermination, same with their bombings of every hospital and ambulance they find, bombing of schools, bombing of historical sites, water & energy infrastructure, AI targeting of families (Lavender, Where's Daddy), quadcopters playing sounds of crying children to lure people in and kill them, 'double tap' bombings that bomb the same target again once response teams are searching through the rubble for survivors, systematic targeting of journalists, and more