I'm very confused as to whether or not roundup(glycophosphate) is actually bad for humans. It seems that the vast majority of studies point towards "no", with that one lone WHO study saying "likely".
It is so hard for adults to admit they are wrong. Even harder if someone has been advocating for their own side at length. To change opinions, they need to have some acceptable exit strategy (e.g. "company A doesn't make vaccines with dangerous component X anymore, vaccines are safe now thank goodness!").
Vaccines are a gamble. They're hard to make, and when they do, they fail in unexpected ways.
But that's mainly because the immune system is hard to understand, not because adjuvants cause autism.