Perhaps this was true in the days prior to the internet, but it certainly isn’t the case now. In fact, social pressures in the online sphere can be the opposite of a moderating force. In the analysis of the online culture wars, many authors have pointed out how the alt right bursting into the mainstream was in many ways a response to the societal pressure to conform to ever increasing (and at times, absurd) rules of a radical “PC culture”.
As a disclaimer, this isn’t to justify the alt right movement or to condemn political correctness wholesale. But the point is that societal pressure is not moderating anything. On the contrary, the internet has allowed people to simply retreat from the parts of society that previously may have pressured them into moderation, and instead to enclose themselves in the parts of society that not only accept their radical culture, but encourage it.
> If the lack of general empathy and over-demonization of the "other" is a problem, well, try being a person of color in the 50s or before.
And yet the rights of racial minorities still made massive strides in absence of the internet. Many of the commenters here have made arguments that along the lines of “a gay person would never have found acceptance without the geographical boundary breaking communities of the internet”, and frankly, I’m not sure that is true. The changing attitudes towards LGBT persons isn’t any more radical than many of the other social revolutions that have taken place without the internet.