I strongly believe that vaccines should be mandatory for any parents who decide to enter their children in public school/daycares/etc. While I also think they should be just all around mandatory, there's not much you can do for kids who have parents that decide to home school them to avoid vaccination. People who don't vaccinate their kids put a lot of other people at risk. There are people too old or too young, people with weakened immune systems (either from diseases like AIDS, chemotherapy, etc), and people who are allergic to vaccines (egg allergies) that can't receive vaccinations, and unvaccinated people put them at risk when it's preventable.

The negative effects of vaccines are enormously outweighed by their benefit. Like Jacob said, those willy nilly side-effects people claim vaccines cause are nothing more than an attempt to throw shade on vaccines. The whole thing started when a man named Andrew Wakefield in 1998 released a study that concluded that the MMR vaccine caused autism, but in 2010 the study was proven fraudulent and was retracted, and Wakefield was charged on three dozen counts, including charges on dishonesty and abuse of developmentally challenged children. After the charges, he was banned from practicing medicine in the UK. After this, people jumped argument after argument trying to discredit vaccines, and every time an argument is scientifically disproven, they jump straight to another argument with no scientific backing whatsoever.

Like Sarah, I believe people should do whatever as long as they're not hurting anyone else, but in this case, parents who refuse to vaccinate their kids are not only putting their children at great risk, but also a load of other people who can't be vaccinated. Vaccines aren't 100% effective, so the chance for infection increases the more unvaccinated individuals there are. Parents who took their young children to Disneyland bring them back with deadly measles (and the vaccine is 98% effective, the MOST effective vaccine), a disease once eradicated in the US. It's far beyond ridiculous. Vaccinate your kids!