Bloody Nazis!

Dr. Willima Lippy, an otologist from Ohio, has discovered that the long held belief that there is a correlation between pregnancy and hearing loss in women is false. This belief, common in the medical community, has been around for 66 years. Who then is responsible for this falsehood that has dissuaded some women from having additional children that they and their spouses otherwise would have desired?

Nazis.

"I fully expect to find out that the relationship between eating massive quantities of bacon and heart attacks was also a Nazi plot to promote the overseas sales of knockwurst, the heartless bastards.

Update: Communists have been discovered to be the source of the widespread belief that venereal disease can be contracted from toilet seats. It's a pity the inventor of the bidet fell for this.