Again, I would tend to agree with not revealing it publicly during the war...but certainly I would have threatened to reveal it after the war, unless the Soviets made concessions regarding Eastern Europe.
Their aim was to eliminate a military and intellectual elite that would have put up stiff resistance to Soviet control. The men were among Poland's most accomplished officers and reserve officers who in their civilian lives worked as doctors, lawyers, teachers, or as other professionals. Their loss has proven an enduring wound to the Polish nation.
Sounds very much like what what the Khmer Rouge were to do later in Cambodia, such policy being part and parcel of the inhumanity that is called Communism.
Anyone ever hear of the world, led by the US, demanding justice for these victims and other victims of Soviet atrocities, as was done with the Nazis? Of course not.