virus is a lifeform, its “purpose” is to continue living and replicate.
Cancer is a malfunctioning cell, it has not purpose at all.
And “purpose” here really means “acting as it is has a purpose”, while in reality virus just follows a bunch of pre-programmed rules. These rules do ensure survival of the virus species, but that is because all viruses with different rules have become extinct long time ago, not b/c virus “chooses” to do things to achieve a “purpose”.
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