Portrait of Dr. Gachet, by Vincent van Gogh,
Since such guidelines are written for clinical professionals, they often contain medical jargon that cannot be easily understood by concerned parents that want practical advice regarding how to ensure the sleep safety of their infants. Thus, instead of reading the AAP guidelines, most parents probably enter key phrases related to infant sleep safety into an internet search engine and may follow the advice displayed on the sites identified by the search engine.
Google Girls, by Defluiter at Wikimedia Commons
Chung M, Oden RP, Joyner BL, Sims A, & Moon RY (2012). Safe infant sleep recommendations on the Internet: let's Google it. The Journal of pediatrics, 161 (6), 1080-4 PMID: 22863258