That's rather an oversimplification. Accept it happens occasionally, ensure that sensible, achievable measures are in place to deal with such incidents as effectively as possible, then either continue or stop.
I don't disagree that there is a trickle down effect, but in the case of the RFU (given the resources available to them), I think it's insufficient to simply look after the top level and assume that everything will fall into place further down the pyramid. Maybe things have improved, but two shameful incidents stick in my mind, one four years ago (National 2 South), one two (County Championship). Both involved a player sustaining what was clear to me from the sideline was a concussion. In both cases he received attention from medical personnel (at least one doctor was appointed for both games) before playing of for the rest of the match (and for that matter, playing the next week). Symptoms exhibited after the match (photo-sensitivity, headache and in one instance vomiting) demonstrated beyond any kind of doubt that it was indeed a concussion. Either the medical staff weren't suitably trained to identify the signs of concussion, didn't realise the risk in allowing the player to play on or weren't sufficiently empowered to prevent him from playing on. Incidents like this could easily be avoided with a bit of eduction.