I'm moving this to the main rugby forum as a one-off exception on the request of four rugby league members of the forum.
This is clearly not a rugby union only point, it's just as likely to be prevalent in rugby league where there are, for example, far too many people who think it's "weak" to come off after a head injury. As such, I'll take an extremely dim view of anyone who tries to make this a points-scoring exercise against union or pretend it doesn't happen in rugby league.
Guardian story, part 1 of 3, the other parts will be out tomorrow and Sunday.
The story is a serious one but I think that the Guardian is covering some parts of it unfairly. I've just had a search of my emails and every year for the last three years I've received an official notice reminding match officials about their duties on concussion, the RFU's website has the newer concussion guidelines on there but, to be bluntly honest, I know the concussion guidelines to a good level of detail but I've never heard them called "Scat". I think it's a bit disingenuous to be targeting the IRB website when it's a rare time that refs go to there for their resources, it's usually responsibility of the national governing bodies to provide this level of detail, that said the IRB really shouldn't have out of date information.
I do think that referees should be given clear and very blunt instructions on this that are not "should" and "could" but "will" and "must", e.g. if a player hits one of the concussion flags and there's no medical professional in sight then the player goes off, if he or the coach refuses then the player gets red carded. There should also be disciplinary action, excessively punitive disciplinary action, against coaches who encourage players to keep playing when they're clearly concussed.
A difficult subject ...