What an interesting set of increasingly bad metaphors.

IT defenses are just an existing human cognitive bias carried forward into a new realm… a bad idea carried forward is still a bad idea.

The cell wall of the vascular plants doesn’t exist to keep viruses (or anything) out, it exists to provide structural rigidity and keep water pressure in… in fact any plant without a sufficiently permeable cell wall dies as a consequence.

The virus in turn isn’t an agent at all, it just passively exploits the permeability of cell walls and membranes in order to replicate. In doing so it helps drive the cell’s evolution, by both acting as a pressure and a mutagen. Life, again, depends on information transfer across permeable membranes.

Nuts and other fruits, by the way, are the sexual apparatus of the plant… they don’t even begin to develop until a migration has occurred, and once they’ve developed their primary purpose is, again, to keep energy and water in more than they’re to keep anything out… in fact they universally fail to function if they’re too good at keeping the outside out.