Cancer diverts the body’s resources to its own growth, disproportionally to its contribution (not that it has any), and rather than doing this by direct and explicit violence like proper parasites it uses the body’s own regulatory mechanisms to trick it into restructuring itself to give away its resources.
The main difference is that cancer is not sentient - let alone sapient - and thus incapable of holding moral accountability.
Cancer diverts the body’s resources to its own growth, disproportionally to its contribution (not that it has any), and rather than doing this by direct and explicit violence like proper parasites it uses the body’s own regulatory mechanisms to trick it into restructuring itself to give away its resources.
The main difference is that cancer is not sentient - let alone sapient - and thus incapable of holding moral accountability.