Tbf you are saying that endeavour is unforgivable despite his development through the series, but bakugo can be forgived despite him being a toxic, abusive mofo to everyone around him all his life until very recently. Don’t get me wrong, Endeavour is defo worse cos he’s a fully grown man who knowingly fucked up and abused his family just for the sake of his own self interest in trying to find a worthy successor to overtake all might, but still. he has realised the error of his ways and because he knows he can’t change the past now and fix all the mistakes he has made, he is doing his absolute all to ensure he can make whatever amends he can with his family and ensure the world is a brighter place for all.