If you don&#x27;t make it compulsory, then it doesn&#x27;t work.  Vaccination relies on herd immunity because the vaccination doesn&#x27;t work for everyone; some people can&#x27;t have the vaccine (allergic to one of its components), for other people it just doesn&#x27;t take effect (biological systems are unreliable like that), so you have to have an over 90% vaccination rate for herd immunity to actually work.  By allowing people to opt out, you&#x27;re condemning a bunch of people to illness and death.<p>Lemme guess, you&#x27;re a libertarian, right?