You can be weak or strong by association.
The same way all Americans are strong by association of belonging to that country. Boy you have limited intelligence.
Then the "strong" americans have failed at eliminating the "weak" vietnamese (North Vietnamese to be exact) and have failed in eliminating the "weak" middle easterners. So I guess that means it's the americans that are the "weak" ones.
The point is, your analogy is bullshyte and you're too damn stupid and weak minded to realize it. If today's society was still truly "survival of the fittest" then you would have been killed as soon it was found out you were mentally damaged.