I have a partial/potential answer to the first one. A friend's brother worked for a wildlife agency, not sure if it was state or federal. They found a track line and followed it 3/4ths of a mile. They said that the tracks went over a log about 4 feet high without disturbing the snow on top. No slipping, no sliding, no apparent struggle with the snow despite the guys having some trouble not winding up on their butts. When his brother mentioned it at work, he was told if he reported it, he would be fired, somehow "with cause", thus he'd lose both his job and his pension. I'm familiar with the general location .. at least I know which canyon they were in .. and it fits right in with our other current thread about where they go in winter.
I think that addresses at least a component of who the scientists are and what is done to keep it quiet.
The rest I think is just through leveraging public ridicule for the topic. They get more mileage out of letting us show our tries and failures, shenanigans within the community, and other things that heap general ridicule on the topic that stop people from taking it seriously than they would from overt effort to suppress all discussion. Trying to suppress all discussion might draw attention of people wondering why that effort is being made which might cause some people who are otherwise oblivious to take a more serious look .. in other words, trying to silence us rather than letting us look like fools might be counter-productive.