Because the core tennet of marxism is "communism abolishes eternal truths, it abolishes all religion, and all morality" marxists have no inhibitions about lying ie denying that marxism has been reinvented and has penetrated widely.
"There are, besides, eternal truths, such as Freedom, Justice, etc., that are common to all states of society. But communism abolishes eternal truths, it abolishes all religion, and all morality, instead of constituting them on a new basis; it therefore acts in contradiction to all past historical experience.โ
Marx & Engels: Communist Manifesto [1848]
What harm did obeying the 10 Commandments ever do?
Except to give Marxism the middle finger? 









