As someone who was possibly involved in certain trails that may-or-may not have been near-ish the area being discussed, and could arguably have been said to have begun at an elevation substantially above the elevation at which they finish, and perhaps been recently fenced off by rangers after many years of enjoyment... I feel qualified to weigh in.
To any ranger reading this, rather than continually reacting to trail construction with fences, signage and star-picketing logs into the ground, why don't you act on your mandate to administer public amenities and meet the obvious demand for steep challenging trails along the urban shores of the Yarra? Yes, it may detract from the otherwise significant beauty of the nearby freeways and drain run-offs, but you would bring a huge amount of joy to a group of frequent park users - a group that experience great difficultly finding such terrain in the flat featureless wasteland that is urban Melbourne. This build/destruct cycle has gone on long enough. Oh, and if you truly are concerned about enhancing the experience of users of Yarra Bend Park - how about you do something about the activities that go on in the twilight hours at Gallatea Point and surrounding bushland, first and foremost?
Now, who's got the phone numbers for 3AW, and that nice lady on A Current Affair...