I'm unsure. I've vaccinated my dc I don't think it caused my ds autism, a lot of the anti vac material is very scaremongering propaganda which taps into people's fear but I do think autism is triggered but by which factors for which people I don't know.
I do believe epigenetics has something to do with autism but I'm not blaming my ds autism on something I may or may not have done. There have been causal links to many things for triggering autism including the tempreture of the mothers body at a certain date in gestation and fragile x syndrome.
Fear can't rule or decisions but it often does as its fear that prompts us to protect our offspring. I would still vaccinate though, my dm had whooping cough as a baby and was very close to death at time my dg thought she wouldn't pull through many nights. That was my fear, the fear of loosing my child to something I could have prevented.