Final answer:
The testimonies of the liberators were important because they provided evidence and documentation of the atrocities committed during the Holocaust.
Step-by-step explanation:
The testimonies of the liberators were so important because they provided evidence and documentation of the atrocities committed during the Holocaust. As Allied troops liberated concentration camps and discovered mass graves, the liberators collected testimony from survivors and witnesses. These testimonies served as historical records and were used as evidence in war crimes trials to hold the perpetrators accountable.