It's "revisionism". The truth doesn't fit the established narrative at the time so they embellish it, delete it, or "retool" it to suit their agenda. That's why liberal progressivism is such a farce. It's all based on what is politically known as "spin" but is what we in the real world call lies. The saddest thing of all is that when they've been proven to be demonstrably false, they just don't care. Just look at the Benghazi case and the killing of our Ambassador +3. Pure bs from top to bottom for weeks and they just kept it up until finally, finally enough questions were asked to where the lie collapsed from it's own weight.