Hi, I just found this topic because we are after the same feature.
Years ago there was a long discussion about privacy that ended with the creation of a setting to disable the user directory. Good! However, if badges are available, anyone can click the Basic trust level badge and find pretty much everybody who matters.
While acquiring badges is cool and knowing how many more users got the same badge is interesting and exciting, knowing who these users are is less to no relevant. In social sites why not, but in community where individual privacy is more relevant it may become too intrusive. Yes, it is still possible to scrap data of users posting, but it is a higher barrier than the badge route.