'Viruses generally mutate to be less deadly, not more.' Some might do but cholera, polio and smallpox and many, many other diseases are still just as virulent

'Viruses generally mutate to be less deadly, not more.' Some might do but cholera, polio and smallpox and many, many other diseases are still just as virulent as they ever were down through the ages. (I know, smallpox only exists in labs but the last known case was a lab worker who died). That argument is essentially a non sequitur, it's attempting to justify a position that doesn't really exist - and even if it did then it'd be by the very slimest of margins (apply with very strict constraints). Even in cases where certain viruses have mutated to weaker strains - and given the high stakes involved (gambling with human life), then you would not only have to be extremely specific but also provide soild/reputable scientific evidence to backup your assertions (i.e.: for specific viruses/strains, etc.).