Rigpig wrote:
Sorry guys, nice try - particularly JTs fog machine analagy which sounds compelling but is spurious nonetheless.
I don't actually think its spurious at all, but in any case here's a better one.
The other night my wife put a clothes horse on the landing to dry some clothes. It is a rather complex folding affair, and she ended up with two of the arms protruding slightly into the doorway, just at a child's head height.
Needless to say, within ten minutes both the girls were howling, having banged their heads on it in two separate incidents. Whilst consoling them I asked my wife to move it up a couple of notches and she defensively said that it wasn't her fault but theirs, for
not looking where they were going.
Quick as a flash, this formed the following parable in my mind...
Some scaffolding is erected in the street, with a pipe sticking out at eye level. Now of the passers by, all the "advanced walkers" see it in good time and react without it being any more than a minor distraction. Now walkers displaying only average levels of observation and anticipation only see it at the last minute and have to react in a bit of a hurry. Still not really a problem, though they impede other walkers a bit and cause a bit of congestion.
But now someone not paying full attention walks clean into it and has a major accident, which wouldn't have occurred at all if the damned thing hadn't been there in the first place.
As he staggers away with the remnants of his right eye hanging from it's socket, the "Scaffolding Erection Partnership" poke fun at him for his lack of observation - it never occurs to them that they are the ones actually causing the problem.
Then someone from "SafeWalk"

comes along and points out the error of their ways, but still there is no remorse. Now they fall back on to their reason for being there, which is that the potentially dangerous roof needed mending. So even though their operation posed more of a hazard than the danger they were there to address in the first place, this is perfectly justifiable because they can now place the blame onto the victim, for
not looking where he was going!
Top drawer. I am going to re-use this (crediting you of course).