From a reader:

Excellent comments! The depiction of the American military in this
film was far more complex and interesting than I was expecting. Yes,
it was American sentimentality that allowed the virus to spread not
some sort of clumsy or heavy-handed militarism. But consider this: by
calling the secure area of London ‘the green zone,’ the filmmakers
suggest a parallel with Iraq. Is Islamism a kind of rage virus? Sure
seems that way.