They’re liars and cowards like all marxists throughout history.
Absolutely correct and we all need to keep saying it. Not only do they depend on the Big Lie, they honor it! They revel in it and they laugh their asses off at those who believe them. Stalin called the believers Useful Idiots and he was accurate.
That deals with the lying so now let's address the coward part. The reason the leaders of the Revolution immediately kill all, no matter how many millions it takes, who may oppose them in any way is because the leaders know that they themselves will soon be killed if they allow any opposition at all. Pol Pot killed one third of the Cambodian population. They are truly cowards. They are like adolescents with guns.