Delta’s rise is fuelled by rampant spread from people who feel fine
https://www.nature.com/articles/d41586-021-02259-2

You mean when you put enormous selective pressure in a virus to spread asymptomatically by shunning anyone with symptoms, it evolves to spread asymptomatically?

Wow, I would have never expected that! I thought viruses evolved according to the most up-to-date social justice.