I will give you example. During Reagan administration Iraq attacked and waged bloody war against Iran. Iranians were bad guys and Iraqis were the good guys.
At that time Iran accused Iraq of using poison gas. It was dismissed as an Iranian propaganda. After Iraq invaded Kuwait and fell out of favor, the criminal use of poison gas and other Iranian accusations became the absolute truth.
Don't you find it a little confusing? Or is your thinking so flexible that it always matches the official and changing position, even about the past events?