Here's one possible answer/theory, in line with Jim's post and Niall's too:
The essence/purpose of golf course architecture is to turn a field into a field of play. It accomplishes this by taking away the straight and unencumbered line between the teeing ground and the pin; and inculcates an otherwise uninteresting walk (a field) with hazards to avoid, obstacles to overcome, challenges to confront, shots to be played, fears to be faced, and alternate routes/choices to be made (a field of play). In other words: if golf wasn't hard it wouldn't be a worse/better game, it wouldn't be a "game" at all.
Far from being spiteful or misguided, it is in fact only the architect that creates/finds difficulties for the golfer to handle and problems for him to solve who is actually fulfilling his mandate and using his craft/talent for the purpose it was intended. We all know this to be true, and so for as long as the game itself has been played those who play it -- the so-called rabbits and tigers both -- have equated a hard golf course with a good (i.e. well designed) golf course.
Neither they nor we are not wrong in believing that; the field of play must be challenging or it becomes simply a field. If there is a problem, it is only this: that over the years some architects (and some golfers and some clients and some magazines) have opted for and fallen in love with unimaginative and heavy-handed and boringly repetitive forms of challenges and obstacles and hazards.
Of course since, as I suggested on another thread, we are now firmly in the grip of "The Golden Age 2-The Resort Course", our tolerance level for blunt and heavy-handed challenges and hazards is at an all time low.
Peter