more to it than you might think
You got a problem with shuttling?
Yes, and they can see us on the trails, too - what's your point?. Do you really think posting info such as this online has an effect? The trails mentioned in this thread are already patrolled regularly - as the rangers know mountain bikers ride them. What more are they going to do? Think about it from the rangers perspective - what could the information on this website possibly be used for?
I'm going to answer your questions in reverse. Yes, posting this info online has a bad effect. You don't know me; I'm just some guy on the internet. So ask someone you know in a local club, like ROMP or BTCEB, that's involved with access issues.
What can the info on this or any other website be used for? What is "the ranger's perspective"? The general rule of thumb is never write anything on a web site or in your e-mail you wouldn't say in front of a judge.
If a rider poaches a trail and is discrete, leaves no trace, is there a problem? Not really. But if rangers start seeing problems or getting complaints, they have to devote resources to dealing with the problem. Those resources being finite means that is time and money pulled away from other projects, perhaps ones involving improved access or needed maintenance, and so on.
Posting and discussing illegal rides also hurts legitimate access, as it fuels the perception that mountain bikers as a group aren't responsible, can't be trusted, and so. And even if the managers or rangers at a given park or open space aren't buying into that stereotype, you can be sure there will be some anti-bike activist who does buy into it, and shows up at a public hearing or politician's office with printed copies of the website or forum discussing the illegal rides.
Just speakin' for myself, I don't think there is a problem with shuttling, per se. Downhill skiers have been doing it for years to access slopes that are near roads but not lift served. But note in that case, these folks are shuttling runs that no one is likely to be hiking, riding or skiing up.
If folks are shuttling because they want to focus on their downhill skills, fine But if they are shuttling on a trail with other users, they need to be mindful of those other users. I think owning a downhill specific bike is like owning a high performance car. Just because I own it, doesn't mean the government is repsonsible for providing me with a place to drive 120 mph.