system
A chat on subreddit /r/NoStupidQuestions
human
&gt;but it significantly reduces it

It does? If that's the case then that's a pretty important point. I'm definitely going to try to study some stats related to that then.
gpt
Just think about it briefly: you’re a virus and you need a host.

Where are you going to incubate if everyone is vaccinated?

Unvaccinated people give the virus more places to incubate, so are promoting the spread (and by definition, likelihood to mutate).