I do not mean to claim they were reason for the revolution, but more that the media as we know them now are basically tame compared to a lot that was written in the past.
It takes more then just unhappiness and anger for revolution to happen anyway. The necessary condition is that the state must be weak and unable to suppress the threat to itself. You can hold people in arbitrary bad conditions for infinitely long time if you have enough power. And they won't do revolution, because you will make it impossible.
Which leads to, polarization is not symmetrical. Some groups of society move toward extreme much faster then others.
Also, we do have less polarization then France had before French revolution.
I kind of think the warning signs are almost always only accurately seen in hindsight.