Vaccines were something a lot of people had just because they were recommended. I doubt if many people really examined the risk v benefits. People who were recognised experts (like my doctor) said that they were a good thing, so hey, it's no big deal getting a needle jabbed in your arm. 'Apparently it'll help prevent me getting sick and I don't like getting sick.'
Then covid. Then the 'freedom-for-me-to-decide-what's-best-for-me' crowd started up. But millions upon millions were dying. So a lot of us, including me, said 'In this situation, where it is obviously a matter of life and death, being an anti vaxxer is a moronic position to hold.' I could care less what political position anyone held. It doesn't actually surprise me in the slightest that those on the right comprise the vast majority of anti vaxxers, but they are morons whoever they vote for.
That's not a political position. And it's beyond nonsensical for you to say so.
The history of that movement may have been different in Australia, but here in the US, but the anti-vaxxers actually used to be somewhat evenly distributed in the form of what's called a political horseshoe (as opposed to a political spectrum)
If a person was anti-vaxx, they were either
A right wing prepper with a bunker and 15,000 rounds of ammo in their basement who thought that the government was spying on them.
or
A white person with dreadlocks who crocheted their own hemp bracelets, had salt lamps to "remove negative energy", and talked about their chakras.
Both parties knew that element existed within their own base, but didn't seem to care much about it.
When the anti-vaxx movement started gaining more traction in the tea party crowd, and became more pronounced on the right, then all of the sudden Democrats were shocked and appalled that anyone could be anti-vaxx, despite tolerating these folks in their camp for 20 years
So it does have a political element.
When there were larger scale measles outbreaks in California, Washington State, and Oregon in the 2010's, nobody on the left bashed hippies for it or said "stupid hippies don't care if they get someone else sick"
That's a common pattern in US politics...when a "problematic" ideology exists somewhat equally in both camps, most don't say a peep...as soon as it's more pronounced on a particular side, then the other side adjusts the script and that problematic ideology all of the sudden gets labelled as "unacceptable" and "the worst thing ever" in no uncertain terms.
The same pattern happened on the topics of gun control, abortion, drug, and immigration laws as well.
Gun control measures and attitudes towards them weren't always a "Democrat vs. Republican" thing...there were pro and anti well represented on both teams, and nobody portrayed the issue as a "deal breaker"
However, once the Democrats got a little more 'anti' and the republicans got a little more 'pro', then all of the sudden we have democrats saying if you don't support their proposals, you don't care about kids dying.
Same goes for abortion...it didn't use to be a huge wedge issue. You had a lot people from both sides who were both for and against it. As soon as a partisan trend started to present itself, then all of the sudden it was "you think it's okay to murder babies" vs. "you don't care about women and rape victims"
All I'm saying is that there's no reason to think this issue would be any different in terms of partisan perceptions and PR spin.