If your child is not vaccinated, they should be barred from attending public school

[Papewaio]

Your body makes a random set of antibodies and with each exposure it makes (attempts to make) a set of antibodies to fight off the current disease and keeps these in the armory for future events. Identical twins immune systems are not identical due to the essentially random creation and exposure of antibodies.

Vaccinations give your body a preview of the disease and hence your body produces the antibodies and has access to them to fight off the disease in the future. It doesn't reduce the other antibodies in your body or the ability of your body to make new ones. It just adds a template to fight disease version 1.0

Those of us who do not get a vaccination might already be immune or we get infected with diesese v1.0 and get ill and suffer the short or long term consequences. Each diseased person has a chance for the disease to mutate into another version. If the version mutates enough it will not be countered by the antibodies for disease v1.0. The new disease v2.0 will then infect everyone who doesn't happen to have a natural immunity.

So by reducing the number of potential disease v1.0 victims you not only benefit the individual you also benefit the group. Enough vaccinated individuals form a moat of protection for the unvaccinated greatly reducing their chance of getting the disease in the first place as all the vectors get removed.

So vaccination of disease 1.0 does not decrease human immune system nor our ability to combat future diseases.

The more that get vaccinated the more effective it is. If it reaches 100% it might even be wiped out. Vaccinations also make it safer for the non-vaccinated. On the flip side unvaccinated people make life more dangerous for everyone from children too young to vaccinate (immediate danger) to the long term health of everyone (vaccinated or not) due to disease mutation.