Earlier quoted context omitted.
This change came already with the invention of radio. We have a century of radio and TV propaganda of the absolutely vilest kind behind us already. At least now there is an exchange with the instant communications, not only one-way.
It did not already come as you say. We are in a new era. It is now very easy to target specific people over a wide geographic region and to do so cheaply. It is easy for bad actors to hone in on those susceptible to the false beliefs they peddle. Hence the rise of morons who won’t vaccinate their children. I’ve read that around 50 percent of the posts online are bot driven. Soon that percentage will be a lot bigger.…
I much prefer living with today's polarization and people disagreeing on minor things like those you mentioned, than in the age of one-way broadcasts where there is no arguing and no other perspective at all.