You're passing because someone is attempting to help people with mental health problems? Perhaps the problem is with you, not the warning.
Triggers and warnings are concepts that are absolutely real, but in most usage is instead a fad and a virtue signal. That much is obvious in this case, when the author puts up a warning for authoritarianism. Please.
I dislike them, but I have met people who genuinely do not want to think about bad things. I can accept the viewpoint, but these are the people that turn a blind eye during genocides. If you really can't handle discussing topics like these I don't mind a warning, at least rather than self-censoring.
However, I'm reminded of the fuss that was made over the term "Joyplot" due to the term Joy Division - ignoring that band is named after the historical term as an artistic statement, it just seems like pandering into the void.
It's not for society at large to dismiss controversial topics (though some people mistakenly use it that way).