This is an example where one needs to weigh the public health benefits of the vaccine against the individual benefits of the vaccine. For a given child, chickenpox is a mild disease, more annoying than deadly. Thus, some parents would prefer to get full immunity from the disease rather the vaccine. In addition, there is the worry about the vaccine wearing off, and then we will find populations of adults getting the disease with their increased risk of complications.
However, from a public health point of view, the benefits of preventing thousands of hospitalizations and dozens of deaths each year is significant. If we can make the disease as rare as measles or mumps, we will have only hundreds of cases a year instead of millions. This will protect those people who are at higher risk of complications from an infection, such as those who are on chemotherapy or women who are pregnant.
we strongly recommend this vaccine for anyone who might need to be on steroids for a chronic disease like asthma. It is clear that people on steroids have a much higher risk of having a severe episode of the illness. Otherwise, our recommendation in favor of the chickenpox vaccine is more from a societal perspective, and we can understand why some parents choose to delay this vaccine.