From what I can understand, like most Wollongong threads this is another shitfight. From my very limited legal knowledge via HSC legal studies, this is how I see it:
Riding on National Parks land involves voluntary assumption of risk. Basically, its defined as the following: the notional acceptance of the hazard or danger associated with an activity by accepting, following or otherwise doing or attempting to do such activities.
So basically, we have no possible way to sue parks for injuring ourselves on parks land. As far as I know, this renders their argument useless and basically, its our own stupid fault for injuring ourselves whilst riding our bikes there. They claim erosion is an issue, I've seen dears do more damage then the tyres of a mountain bike rider, its the clearing of the tracks that really was the issue. Single track, which Keira was until kids with shovels came is quite easily built into a sustainable manner, which can actually minimise erosion in comparison to leaving the hill bare.
We need knowledgeable people to front this argument, and I love your passion Ty, but I think we need a face with a little bit more life experience and knowledge to lead the way in the argument for sustainable trail development at Keira. Either way, the way the tracks were headed needed to be stopped and this might be a wake up call for us all. The solution isn't to cut a new line in each week, we should be looking to maintain one line as best as possible, and to be able to cope with the amount of traffic that Keira does get, though by now this may be a lost cause.