Chicken pox can be a rather serious illness. It can be mild--or, it can damage eyesight, put a pregnancy at risk, or merely cause very substantial misery.
The way of dealing with chickpox differs between (western) nations. In my country we don't vaccinate against chickenpox broadly, only some risk groups. We do vaccinate broadly for other illnessess, and the public mind is nudging towards denying child care for anti-vaxxers. I think a main driver for the non-vaccination of varicella is that the risk for children is small when compared to the risk to adults. Vaccination gives about a 90% protection after 14 years, probably decreasing over time. So we could replace the near 100% incidence of varicella in children with several vaccinations over a lifetime, but chose for natural protection.
It's the typical Asheville trustafarian culture of naturalistic fallacy gone mad.
While the as antivaccers are morons, chicken pox is a pretty benign illness to make a big deal about.