I don't understand why some people are so much bothered about EM fields and stuff. I don't know any household source that can expose you to such levels of radiation that would be deemed harmful (be it anything from UV to long wave radio).
This is an extreme example of one such insanity. (Real detected)
Many reasons for that
1) EM radiation is invisible and people are afraid of things they cannot see. Same thing with germs for example
2) EM radiation is one of the toughest subjects in physics and electronics. Even EEs have trouble understanding all the concepts and intricancies about EM. To your average Joe it sounds like voodoo magic.
3) Ionising radiation and the damage it can do (eg Chernobil) is well known to the general public and conflated with non-ionising radiation. See number 2. It's tough stuff and you need the proper education to understand the differences.
4) There's the stupid notion that dosage doesn't matter and even the tiniest exposure can do damage. This of course isn't true even for ionising radiation
5) Some people through malice or stupidity propagate false information. Some benefit from this by selling all those bogus devices.
Very valid points - I also think a great deal of fear for "radiation" came from the Hanford tests during the Cold War when a large volume of radioactive Iodine was released into Washington State and the surroundings got a very large dose.
The government in it's wisdom then claimed the dosing was small - so if you received a large dose and get sick, but were told it was a small dose - what other conclusion could you have drawn, other than that small doses of radiation are harmful?
I think a great deal of the cultural fear of "radiation" descended from this: how many articles have you seen in the past about "overhead power lines causing me cancer" or "mobile phones cooking your brain" or "microwave ovens causing epilepsy" or "radio masts causing autism in children that received the mmr vaccine"?
As fubar.gr said, it's something you can't see and don't understand: and you know there are situations were it's bad, the result is you don't want it in your home.
As James Randi once said: "Ignorance is both hereditary and contagious"; and if somebody is willing to make money from your ignorance then the world's their plug-in EMC-cancelling oyster.