In the United States, for some groups, it might be about "owning the Libs," but if you look at the anti-vax movement around the world, there are people on the extreme left, the extreme right and in the middle. You can't pigeon-hole them as one group. Maybe the only thing they have in common is consuming social media lies. So blame Mark Zuckerberg.
The hard thing for government in Europe right now is what do do about it. Bringing in lockdown restrictions just seems to prove to these people that they were right all along--it's a massive conspiracy by big brother to take away their freedoms and civil rights. So it drives all these people to join the same aggregate--you've got unvaccinated neo-Nazis banding together with unvaccinated hot yoga instructors and they're all sharing the same air, increasing the chances of infection. Which will ultimately overwhelm the hospitals and make a worse situation intolerable.