It's also possible that the dissenters are aware and knowledgeable of the history of compulsory vaccines. The question in their minds might be how society determines which vaccines should fall into that mandatory category and what level of force the government and others should use to enforce it.

For example, should flu vaccines be mandatory to attend school? Historically they have not been in any large degree (to my knowledge). If you look at the IFR for those age groups for flu (varies somewhat by strain) and covid, then you'll see that they are generally very close. So we have to ask what changed, because it doesn't appear to be the value proposition.