I don't think it weird. You have to look at it right, here we have Sombra a big bad guy with a past no-one knows but himself and he was locked away for a thousand years to make matters worse. He was labeled evil but we will truly never know why. Maybe he became evil to gain power to better protect his people but something want wrong and he was corrupted by it. Some people say kindness goes a long way, Sombra is no different from anyone else he needs to be shown kindness as well. It was cruel what they did to him in the show, they casted him out and then killed him off. Just imagine the things they could have done with his character if they redeemed him from his state of madness and anger. That just what I think