Decades of testing. Like using other vaccines and adjuvuncts as placebos instead of saline. Like covering up evidence mercury in vaccines caused autism (and then removing mercury "even though it has no evidence of harm"). Decades of people being told adverse events shortly after vaccination were unrelated to jabs so they couldn't be reported or get compensation. I'm tired of hearing "I'm not anti-Vax, just anti rushed not properly studied vax", if only they knew.