I'm curious, what research have you done?

As for your kids being healthy - It's called herd immunity. When most people are vaccinated others can enjoy the benefit of being protected from diseases even if they aren't vaccinated themselves. However since about 2008 there's been a resurgence of easily preventable illnesses like chickenpox and measles because people refuse to vaccinate their children.

You don't have to blindly trust the health of your children to the system - I encourage you to do research. There are tons of studies out there about vaccines and they have found vaccines to be safe with no link to autism.