My late wife lost her younger brother to a drunk driver as he walked to a Swindon Speedway match. Some years later she was in a Swindon amusement arcade with her dad when when the man responsible walked in laughing and joking with a friend. Try and imagine how they felt. Years later my wife's dad could get by over the loss of his son to the extent that we could go out and enjoy a pint together or visiting gardening centre's which he enjoyed.As somebody who has lost a family member to a drink driver, the chanting makes me feel both sad and angry.
Leave the family to their grief. Do not insult or use the memory of their children to make some cheap, nasty point at a football match. Do not pretend you are doing it for anybody but yourself.
As for the parents of those two small boys, they didn't get off so lightly simply because the father is confined to a wheelchair, therefore the poor mother's day starts from getting her husband out of bed, going through their daily routine before preparing him for bed again. Some day, some week, some life.
Why'll I don't suppose I could bring myself to barrack the fellow, neither will I be making excuses for him either.