[acumenical]

> surprisingly common at 1 in 30,000

You should reevaluate what you consider common. Schizophrenia, a condition you probably rarely witness in every day life, is around 1 in 100. You don't interact with 30,000 people even over the course of a year.

[jdiff]

Visibility has little impact on commonness. Something can be ubiquitous and invisible. That doesn't make something common-but-less-so rare.