I don't think it's that simple. The politicization along the US lines is a specific US phenomenon, it appears to be the result of a polarization along the two-p

I don't think it's that simple. The politicization along the US lines is a specific US phenomenon, it appears to be the result of a polarization along the two-party system. I don't see how it can be explained by political opinions themselves. To give you a comparison, before Trump and the pandemic, German antivaxers used to be from the esoteric, ecological nutrition and alternative healing communities, a subculture highly skeptic to traditional medicine with many connections to other fringe cultures. These were mostly left-wing progressives. The right-wing political flavoring came during the pandemic and from the US. This lead to rather bizarre scenes like this radical right-wing vegan cook book author or 70s peace-movement elderly feminists marching together with young Neo-Nazis in antivax protests.