I've seen this pattern ape'd by a lot of younger people in the Trumpzone, so maybe it has its origins in the older dementia patients, but it has been adopted as the tone and writing style of the authoritarian right.

That type of writing has been in the tabloid press in the U.K. for decades, especially the section that aims more at older people, and that currently (and for a good 15 years) skews heavily to the populist right.