Here's my op-ed that uses long-term orientation, probabilistic thinking, numeracy, consider the alternative, reaching our actual goals, avoiding intuitive emotional reactions and attention bias, and other rationality techniques to suggest more rational responses to the Paris attacks and the ISIS threat. It's published in the Sunday edition of The Plain Dealer, a major newspaper (16th in the US). This is part of my broader project, Intentional Insights, of conveying rational thinking, including about politics, to a broad audience to raise the sanity waterline.
One element of fascism is a desire to restore (alleged) past glories.
(I am not in fact convinced that "nearly everyone before the 19th century" has the characteristics I described. Some of them don't even make much sense before the 19th century; e.g., the sort of leftism Hitler worried about, or the sort neoreactionaries worry about, didn't exist in that form before the 19th century. But that's a separate argument, and for now I'm happy to stick with this one.)
I don't understand the "So". Lots of time-dependent things are useful.
What someone's opinions tell you about that person depends on the context they're in. Suppose I tell you someone believes that the earth is at the centre of the universe, and ask you for a probability distribution on their IQ. Then I ask you the same about someone 1000 years ago. You may very well give different answers. Suppose I tell you someone thinks democracy is a terrible idea. Again, any guesses you might make about their character or about other things they believe may be different depending on whether they're in present-day England or present-day North Korea or revolutionary France or Periclean Athens.
Depends on what you count as a law of human nature, and what timescale you're interested in. Human biology probably doesn't change much on (merely) historical timescales, but human societies certainly do and human brains are pretty malleable. Human biology probably does change enough to matter on, say, 20k-year timescales, and maybe there are places and times when it changes much faster (e.g., consider the debatable but not obviously crazy suggestion that Ashkenazy Jews are exceptionally smart but extra-susceptible to various interesting diseases because of strong selection for intelligence over the last millennium or three).
So you're arguing not wanting to live under a leftist totalitarian dictatorship with an economy based on a delusional economic theory makes one a fascist?