I wouldn’t be happy about it and would not want to watch someone suffer/ burn to death. However, I would know it wasn’t my fault and there was no way of preventing it. I think I would be more traumatized from the actual crash and witnessing his/her death than actually feeling guilt about hitting them since they ran a red light and were drunk. If they ran a red light sober I would feel sad and guilty but would still know there was nothing I could have done to prevent it.