Well, nearly everything a person does in mainstream western society has ongoing potential negative consequences etc… Our system is unsustainable as it stands; driving gasoline cars kills babies in the Middle East and Africa, whether we admit it or not, and most of us seem to find this unimportant, or at least less important than driving to the movies.
But I’m going to hope that you gave your friend a new perspective on vaccination, and also that your own illness stays in the past. I prefer to speculate on the possible good outcomes if there’s really no way of knowing!
