>The older I get, the more I realize how fragile a lot of human systems really are, but I suspect it has always been this way and it won't change significantly any time in my lifetime
I agree that human systems have always been fragile, but have long been papered-over by things like "decency", "tradition" and "doing the right thing" and in extreme cases, mobs with pitch-forks.
I disagree that it won't change in our lifetime(s) - the extreme polarization and tribal politics will get worse and people will let systems break - or intentionally break systems just so that their team will gain a short-term win. I have no idea what new horror it will take to remind people to be decent to each other again, but looking back at how divisive COVID-19 was, I'm not hopeful.