Machiavelli
Well-known member
That's not quite how it works. Viruses don't mutate because of need, they just mutate randomly because that's how biology works. Sometimes the mutations go on to replicate a lot, sometimes they don't. But they don't not bother simply because an existing strain is spreading a lot. They don't know that's what's happening.
I'm fully aware of random mutation, which is a much better characterisation of Darwin's theory than natural selection. That said, mutation isn't quite that random: Darwin wasn't articulating chaos theory. Of course, strains don't know what's happening (which is why I used need rather than want) but, if they've got an opportunity to carry on regardless (which they have at present), that's the course they'll take.
That said, I'm not an epidemiologist or a virologist, and am more than open to be proved wrong on this.