Not keen on the idea of teaching basic climbing skills to walkers. I think they would not practice those skills often enough to to be competent but might acquire a perceived confidence which might cause them to try routes/escapes beyond their capacity. Also of course, it is unlikely they would have any climbing equipment with them.
This particular case seems to have been weather related. Maybe if a warning notice about the danger of the route included a "have you checked the weather forecast" type warning, this might cause some to think twice. Of course, there will always be "numpties"!
Having climbed Sharp Edge several times, I would only ever try it in good conditions and following a good forecast but if caught unexpectedly, I think it is safer to go up than down, then find a safer, even if longer way down.
