My children will never get Chickenpox

I remember having Chickenpox when I was a kid and I still have scars from scratching to remind me.  Those were the days of chickenpox parties.  I am so thankful that my 3 children will never have to suffer the pain of sickness of chickenpox along with the dangerous risks associated with it.  Watching your child suffer in illness is so heart breaking... why would anyone choose to not get vaccinated against a preventable illness?