Are people really this gullible?

The government say's kids must get their vaccines or they can't go to school. But in most states, like my own, it is NOT the law. It's a mandate. I never had my shots. I've never had chicken pox, I've had the flu once and the only time I get sick is a cold I get twice a year because of the weather changing. I went to school as well, without my vaccines. There is an exemption form you can file with the school and public schools can not turn your child away as long as that is on file. So why are so many parents so obsessed with telling other parent's it's the law? Are we that gullible that we just listen to what we're told instead of looking it up ourselves?