It’s irrelevant if they themselves are in their hearts are evil. People in powerful positions who leverage that power to diminish the historical importance or even existence of a genocide (or, for you, merely an intentional man-made famine directed specifically at a subset of a population deemed undesirable that resulted in millions of deaths) are acting as a force of evil.

Waving your hands and uttering the incantation of “we can’t know if they are evil” doesn’t disappear specific evil actions.

And, good actions don’t “cancel our” the bad ones either. Volunteering at a soup kitchen doesn’t give you a free pass to beat your wife.

Each action is evaluated within it’s own context.