With all due respect, the only ones I've seen make that assertion are the PRO vaccination crowd. And they make it repeatedly. Almost as if they had a physiological fixation on the subject.
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So, with that in mind, I refuse to even remotely side with the anti's.
No one is guilty by association, and being cautious does not make one "anti vaccine", and "anti vaccine" does not, by default, make someone "pro cancer".
That's one of the most ludicrous rationalizations I've ever heard.