The saddest example I see of pseudoscience is in the birth communities, medical technology has taken us out of the tragic "good old days" when 1 in 10 babies and 1 in 100 mothers didn't survive a birth. But suddenly everyone thinks it's a great idea to run away from hospitals and doctors and use untrained homebirth attendants, even for high risk pregnancy. In Australia death rates are four times higher for homebirth babies.
Having recently been pregnant and seen the "trust NATURE" mantras thrown at me again and again in online communities, I'm so afraid of who else is being mislead. But the consequences are unimaginable.