In Scotland John Knox was an odious hypocrite with a 15-year-old "wife" who preached hellfire and damnation to sinners and Catholics. Yet he was historically progressive.
Both these "gentlemen" were leaders of a bourgeois revolution which unleashed productive forces which were undreamt of in feudal times. And a bourgeois revolution which lifted people out of feudal idiocy and superstition.
You don't have to be a nice guy to be historically progressive. End of story.
As to the debate about statues, perhaps we should leave that until after the socialist revolution.