If Vaccines don’t cause Autism why is it a side effect listed on the package insert with the FDA

http://www.fda.gov/downloads/biologicsbloodvaccines/vaccines/approvedproducts/ucm101580.pdf

It’s on Page 11…
“Adverse events reported during post-approval use of Tripedia vaccine include idiopathic thrombocytopenic purpura, SIDS, anaphylactic reaction, cellulitis, autism, convulsion/grand mal convulsion, encephalopathy, hypotonia, neuropathy, somnolence and apnea. Events were included in this list because of the seriousness or frequency of reporting. Because these events are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequencies or to establish a causal relationship to components of Tripedia vaccine.2″