I have, yet another, dumb question.
Don’t viruses become less lethal the more they mutate?
In the long run yes.
Right now it is mutating to evade “capture”
https://www.cnn.com/2021/01/06/health/mutations-coronavirus-vaccine-evade/index.html
Was it designed to do that by the Bat Lady?
Who knows
“Don’t viruses become less lethal the more they mutate?“
Yes, yes they do. Replication is never perfect and very rarely is a mistake in favor of whatever is being replicated.