Many countries have mandatory vaccines for diseases such as diphtheria, tetanus, pertussis, hepatitis B, poliovirus, Haemophilus influenzae type b, measles, mumps, and rubella.
Of those where it is just "recommended", most parents chose to get their children vaccinated. All these vaccines have a risk of side effects.
Australia's stance:
Vaccination is not compulsory and parents will continue to have the choice whether or not to vaccinate their child. However, conscientious objectors can no longer enrol their children in child care and will need to make alternative arrangements.
https://www.health.nsw.gov.au/immunisation/Pages/childcare_qa.aspx
See, we have freedom to choose, just like in Australia. But in the same way you have freedom to choose to get a passport, driving licence, bank account, if you don't you might find life less fun. Don't complain about your personal life choices, and don't be critical of "sheeple" that think differently to you.
Although, must less opportunity to get into angry arguments with people on building forums if you do that ...