> None of the deaths were considered by the study investigators to be vaccine-related. The five deaths in the 9vHPV vaccine group were the result of suicide (15 days after vaccination dose 1), acute lymphocytic leukemia (diagnosed 27 days after vaccination dose 3), traffic accident (226 days after vaccination dose 3), hypovolemic shock and septic shock (531 days after vaccination dose 3), and sudden death (678 days after vaccination dose 3). The five deaths in the qHPV vaccine group were the result of accidental death (airplane accident 7 days after vaccination dose 3), spinal cord injury (141 days after vaccination dose 3), gastric adenocarcinoma (diagnosed 403 days after vaccination dose 3), cervical spinal cord injury (811 days after vaccination dose 3), and cerebral hemorrhage (1114 days after vaccination dose 3).
For example, you might be tempted to dismiss deaths due to traffic accidents as being obviously unrelated to a drug. However, if there were a lot of them, it would be prudent to check for potential effects on reaction times or judgement.
Similarly, while there may be ethical concerns with using a placebo, statistics and biology do not care about ethical concerns. There are real results which come from medical treatments, and ignoring them does not make them go away; it just makes us ignorant of them.