Ok Nick my bad but it still fails logically
A.) penalties are given for infringments
B.) cards are given for repeat infringements
C.) there should be a similar card to penalty ratio for all teams
I'm sure you will agree this is not a valid argument
Well, that argument is invalid because of the presentation, because the conclusion does not follow from the premisis, but that argument all falls on the choice of wording you used to present the argument - I took their argument as this.
A.) Yellow Cards are awarded for a large number of infringment.
B.) The All Blacks have infringed a large number of time.
C.) Therefore the All Blacks should be awarded yellow cards.
If their argument is based on referee bias however, comparing teams can be used as such to make the argument you just presented, valid -
A.) Referees enforce the rules of the game.
B.) The yellow card ratio should be consistant with the number of infringments amongst all teams.
C.) Inconsistant penalty to yellow card ratio, shows a bias.
D.) Referees have awarded the All Blacks less yellow cards than South Africa, despite their penalty ratio being higher.
E.) Therefore referees must be bias.
That makes the previous argument valid (the presentation of the argument is arguable better suited, but once again the argument is not sound, as the second and third presmis is wrong. Remember, valid does not mean their view is right, it only means that the conclusion logically follows from the premis. If the premis is wrong it does not make the argument invalid, it makes the argument unsound.