Vinland Saga's Thorfinn is a kind, good-hearted man who seeks only to create a world of peace and equality for all people. However, he is also the protagonist of a work of historical fiction. So, when the real-world inspiration behind Thorfinn is the subject of controversy, it can naturally call into question the true message of the series he is a part of as well.
Source:https://www.cbr.com/vinland-saga-thorfinn-kalsefni-historical-inspiration-challenge-inequality/