Same with the Essendon argument, the reasons and why Justin or Essendon players took the drugs, matters zero. They took them, they were proven to have a banned substance in them. Whether it's intentional, bad luck or whatever, if it's a banned substance, the players need to be held accountable.
Same with Warney, regardless of the reason, we can paint it up to be this lovely story about weight loss, which may be true. If it's banned it's banned and there needs to be consequences to deter players doing it and absolutely ruining professional sport.