"Hitler slaughtered six million people" - It's sad that people continue to promote this lie, why do you think they had to change the plaques? Why do you think they had to invent laws to stop people investigating or simply asking questions about the so called Holocaust? Which one do you think needs laws to protect it from investigation, truth or lies?
27 million Russians were slaughtered by the Nazis yet you don't see laws being created to protect that from investigation do you.

Here you see how the 6 million figure was implanted into peoples brains long before the so called Holocaust, AKA brainwashing.