A point made back in the day is that Flintheart Glomgold (classic flavor, not Captain Wacky 2017) isn't Scrooge's EVIL double, he's Scrooge with no family. Donald and the triplets are what redeem him.
If Flintheart Glomgold and John Rockerduck didnt exist Scrooge McDuck would be a completely unlikable monster. Even Barks toned him down over time. Hell, he WAS a monster in Italy for years until that version of him was toned down to align with the modern revisions of his personality and backstory