Passage Summary: Because modern society is constantly churning out new trends and subcultures, the traditional identities of nations are being threatened.

Conclusion: Modern culture poses a danger to the survival of existing national identities.

Reasoning: Modern culture is rapidly generating a vast array of new fashions, ideologies, and movements at an increasing pace.

Analysis: The commentator is making a leap from 'lots of new stuff is being created' to 'the old stuff (national identity) is dying.' This assumes that these new fringe movements are actually competing with or replacing national identity. To weaken this, we need to find a reason why a explosion of subcultures doesn't actually hurt a nation's core identity. Look for an answer suggesting that people can embrace these new fashions while remaining loyal to their national roots, or that these movements are too small to pose a real threat.