A vaccination is a medical procedure and no medical procedure comes without risk to the individual receiving it. Vaccines are man made and subject to contamination. Vaccines today still contain harmful preservatives/substances and at times their efficacy is questionable.
Just as an individual has the right to medical consent, an individual should be able to accept or decline vaccination based on their own individual choice between its benefits and risks. If an individual exercises their right to decline, their declination should not have adverse consequences regarding ones admission to school or continued employment in their workplace etc.
Mandatory vaccines place negative consequences on failed compliance to a medical procedure. This is coercion and it is unethical.