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THIS! Since he succeeded in realizing it was his people teaching this prejudice, not his faith, he didn't have to lose that important part of himself to become less prejudiced. And he probably wouldn't have anyways, but still. Some would've distanced themselves from all of it to become a better person or might've had to. But he didn't.
Really, really need people to understand how important it is that Matthias kept his faith while unlearning the toxic beliefs that people had instilled in him. That’s really important to his character actually.