I think the problem is that small groups no longer exist. The internet is a vast and deep public space just line our planet. You could never hope to explore every part of the internet just as you'd never expect to explore every inch of our planet. So just as it's possible for there to be vast parts of our earth that millions of people will see except for you, it's also possible for there to be vast public forums on the internet that rational thought won't ever reach.
* Typo