Where there is a significant risk that can be reduced, the NRL have an OH&S and responsibility to do so. That's quite apart from their responsibilities under negligence, liability and litigation risk management.
It's the same as the moves to have concussed players assessed and rested. Failing to do this could eventually result in litigation and liability nightmares for the NRL. Once again, Gallop appears to have his head in the sand on this issue. What say some footballer (in the NRL or in park footy) goes beserk and just keeps beating someone in the head? If the teammates don't intervene to stop it (for fear of heavy sanctions) there may be permanent injury or even death.
The only players who should have been even considered for the sinbin were Hinchcliff, Lussick, and of course Blair had to go. Why do we have bother having video refs if so obviously wrong a sinbinning can occur as Gift's?
The only players who should have faced potential suspensions were Hinchcliff, Blair, Fully, and Gift. All the others took actions to mitigate risks. But Gallop hysteria took over again and he roped the others in.