I also firmly believe that ladder accidents are operator error, i first started cleaning windows from 1985 to 1999, in that time i came off the ladder 3 times, on all 3 occasions it was my fault. First was ladder slipped on the icy patio second i had the ladder at a stupid angle which to be honest i knew was dodgy but went up anyway, 3rd time was i climbed up on to a wet tiled roof and sliped on the way down.