Well, first off, I vote to discard and make fun of the idea that we are “in a post-truth era.” That’s the kind of self-indulgent, pseudo-intellectual claptrap I decided to leave behind forever, back when I was a teenager. It’s one of those ideas which uses the trappings of a “scientific observation” to try to hide a prideful refusal to accept responsibility for one’s part in the mess we’re in.
I do think we are in more of a mess than we have been ever before in my lifetime at least, but I would suggest that it is sort of like a weather situation. That is, when there’s a cold front moving through, and a lot of warm moist air hanging around, we get rain or snow. How intense it is, depends on a lot of other factors, such as how warm it WAS, how cold the cold front is, how fast it’s moving, and so on.
Right now, we seem to have a number of “anti-truth” factors intersecting at the same time. In the past, when one or even both candidates spouted lies and half-truths, the bulk of the mass media would react by pointing them out, and directly questioning the politicians about their errors. But now, with the ability of various factions to fund their own mass media representatives, as well as to fund their own “scientific support,” there is no clear demarcation between who is after the ACTUAL facts, and who is pushing an agenda.
In addition, by chance, both of the major political parties have decided to make factuality and honesty, secondary concerns, to gaining power. Why that is, is difficult to pin down. It might be because, with all the ability of people to both find or leak ACTUAL scandalous events, and the ability of almost anyone to manipulate the internet (by making up multiple “verification” sites), it’s harder than ever to find a group of people who DON’T have “feet of clay,” or corrupt or even despicable members.
In short, we do seem to be suffering from a “perfect storm” of anti-truth. However, like the weather, factors are bound to change and evolve, so there will be no such thing as a permanent “post truth era.”