system
Given the following post, respond as if you're commenting on Reddit:
human
Why is the WHO now saying that fully vaccinated people still need to wear masks because of the delta variant?

From what I recall, there’s supposedly good evidence to show that you don’t transmit the virus if you have been vaccinated. And that the vaccines are still very good against the Delta variant. What was it that changed?
gpt
Because significantly lowered risk is still >0

Because you can still get it. You're just less likely to pass it along, and it won't likely kill or hospitalize you. And this strain is even more contagious.

And because we have no way of knowing if unmasked people are vaccinated or sociopaths.