I believe the worry was twofold:

1) That people who couldn't be vaccinated would get the virus later in life (because it would be less common), when it's a much more serious illness.

2) That there was a protective effect against shingles from having people regularly encounter the disease by encountering children with chicken pox.

But it turns out that the latter isn't actually an issue.

wtfff

are there more vaccines they're hiding from us?