Punish the racists not the sport, can't disagree with Mario but I can see this becoming a thing that will help kill the game because the game has become more and more political over the last decade.
Find and challenge them and then if a crime has been committed get them in front of a magistrate, at present we've got initiative after initiative and with my hand on my heart I can say I don't believe the FA UEFA or FIFA care one jot because fines handed out don't bear that out.