Poll: Unvaccinated Americans least concerned about Delta variant
(www.politico.com)
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So, not disagreeing on principle, but your initial claim is false. Mutations of a virus can make it more or less lethal, or not change its lethality.
This is true but it less lethal but more infectious mutations out compete the more lethal mutations. So the overwhelming trend is to lower lethality. Not always just in the vast majority of cases.
The narrative around Delta is always about infectiousness and case counts, not overall lethality. Aka bullshit
Nor for pandemics. Every pandemic since records began has mutated to become more contagious and less deadly.
If you're talking about viruses in general, then yes, but again, a pandemic needs to become more contagious but less deadly to survive.
Natural selection forces viruses to become less lethal. More lethal varieties kill the host so that their lethal characteristics do not propagate.