Teleological fallacy.
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Not in the slightest.
Demonstrably true by observation.
No, “to survive” implies some kind of plan. You couldn’t observe one even if it existed. I’m not going to continue to reply when people don’t understand the principle of teleology and its fallacious application to nature.
Viruses mutate, for whatever reason.
Some of those mutants have a better chance of surviving attacks by immune systems, or whatever else is out to kill them.
So, while it may appear to us that viruses mutate to survive, that’s only because we’re not paying attention to what happens to the individual viruses. No virus actually chooses to mutate as a survival strategy.
steve86 has it right.