Commander Kinsey wrote:
Doesn't giving a coronavirus vaccine to everyone increase the chances of
the virus mutating to avoid the vaccine? So we should be using it
sparingly.

Look up terms like "evolutionary pressure" and "genetic drift".

Whether humans developed "herd immunity" by natural infection,
or developed immunity-by-vaccination, the evolutionary pressure
is the same. The unsuccessful variants are crushed, only to
be replaced by new variants. See "seasonal flu", for an example
of a dynamic equilibrium. (Genetic drift there, easily invalidates
this years flu shot, when next year rolls around.)

The difference between the two scenarios, is a lot more people
die in the natural infection case. And the variants still appear,
because there are so many "incubation cauldrons" for the
natural infection case. There is added misery, because there
are no beds for everyone (see India for examples of what that
looks like - throwing bodies in the Ganges!). Are you a floater ?
Is there a body of water nearby, for your disposal ? These
are things to consider with the "natural infection" scenario,
like whether you're a floater or not. Others will place bets,
on how far out to sea you'll get, before you're eaten.

Paul