> In addition to suppressing some inconvenient truths they filtered out crackpot ideas that have become a plague in modern times.

Every idea starts out as some fringe crackpot idea relative to the status quo. Government recognized marriage of a same sex couple comes to mind as a recent example. Some ideas (e.g. "the general public should wear a mask in public to reduce the spread of coronavirus") make it from crazy to accepted faster than others.