Wendigo is a mythological creature or evil spirit originating from Algonquian folklore. The concept of the wendigo has been widely used in literature and other works of art, such as social commentary and horror fiction. The wendigo is often said to be a malevolent spirit, sometimes depicted as a creature with human-like characteristics, which possesses human beings. https://en.wikipedia.org/wiki/Wendigo
Seems skeptical, at best, if the psychosis is even real and not just a retroactive diagnosis based on third hand story telling. https://en.m.wikipedia.org/wiki/Wendigo
Writing manifestos isn't illegal and neither is bomb crafting, as long as you do it in the privacy of your own home and don't mail them to other people.