Modern medicine and society has allowed us to be so healthy that people can no longer tell the reason they are healthy is mostly from vaccinations of the population, sanitation, water quality, etc. Its easy for them to attribute health to "living naturally"
I think here you have hit the nail on the head, because lets face it, there is no antivax movement in countries where people die from curable diseases.
readily available sources constantly questioning the validity of climate change
Yes, plus people's lack of ability when it comes to questioning the validity of those sources!
Good comments, thanks.