Mrs.S - I hope this comes out the right way because I don't want to sound critical of you at all, but there are many other reasons someone might have for wanting anonymity, especially with regard to Hermes.
First, one of the more obvious aspects of Hermes in general is the discreet nature of the house - it doesn't really lend itself to this type of environment to begin with. So while it's absolutely invaluable and something those of us who participate truly value, it's not necessarily something you'd choose to discuss with certain more low-key or veteran SA's.
And while I'm sure there are exceptions to the rule, there are those of us who maintain the exact same persona online as we do in real life, but STILL greatly desire our privacy for many reasons. Obviously safety is one concern (as was already astutely pointed out), but sometimes people just don't wish to be identified and value their privacy in general - in their everyday lives as well. It's an extreme overgeneralization to necessarily assume that means they have something to hide - it could just mean that they'd like to maintain some level of the discretion on which Hermes prides itself.
Or we could just be shy.