That’s not really true. For 12 days, Hind’s car and the ambulance were in a closed military zone controlled by the IDF who would not allow anyone in or out. They knew exactly where they were because it had been geolocated and the PRCS had coordinated, and gotten permission from the IDF to send an ambulance to that location to rescue Hind.
No one wanted to accuse IDF of having killed them in the zone they controlled, they hoped perhaps the IDF had rescued Hind and detained the ambulance crew.
Then IDF withdrew from the zone and allowed PRCS into it. PRCS found the vehicles and bodies. There are photos online of the vehicles.
IDF knew what had happened but were silent for 12 days and are continuing to stay silent apart from saying they are looking into the incident.