Moreso that Kylo is a character who children have on their lunch boxes, dress up as for Halloween, have multiple action figures of.
Star Wars is a family friendly series and I don't know how anyone believed that the final Skywalker would end up being evil and destroying the family name. What an awful conclusion to the Skywalker saga. He got redeemed in the best way possible. He finally decided to be good and realized he needs to own up for his sins and sacrificed himself so Rey can live on.
Seriously. People who think otherwise are being silly.