I’ve done some thinking about pop myths and even not-so-popular “conspiracies” and I’m kind of assembling them into a few distinct categories:
1) Vitalistic (spiritualistic or feel-good myths; “organic food pollutes less” and homeopathy)
2) Mistaken interpretation (“contrails are chemicals” and “reverse speech”)
3) Ignorance or denial of contrary data (global warming and evolution denial [the rare gravity denialist, too], anti-vaxers, etc.)
4) Oversimplification (DNA=code, biological=genetic parents, etc)
Got any more, let me know!