Best evidence indicates few harms, so it's spurious to ascribe a plethora of problems to HPV vax. https://twitter.com/itsmepanda1/status/747775703920279553 …
Each 'tier' generally provides stronger evidence than the one below; it's simplified but still a decent guide.
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So to provide convincing evidence against a SR, you'd probably need to either seriously discredit it or have a v. large RCT.
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In essence, a SR is thousands and thousands of scientifically verified anecdotes, so anecdotal evidence isn't v. compelling.
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