There is no justice in war, and the victor is always just. The Allies are the victorious powers, and the right to speak in history must be in the hands of the Allies. Just like the Communist Party promised the Kuomintang, the Communist Party called it a war of liberation, and the Kuomintang could only listen to its defeat.
There are also unjust acts in a just war. For example, when the Soviet army invaded the occupied areas of Germany, it was also atrocious. When it invaded the German mainland, it was also burning, killing, looting, and massacring eight thousand unarmed Polish soldiers. It was just. The party will not mention this.