How does the dystopian vision in The Children of Men present a warning for modern society?

One of the important themes in the novel is how important
children are to civilized society. Whether a person has children or not, all of humanity
knows that children are the future of the world and the reason to leave a legacy. If
there are no children, there is no point in struggling to invent, innovate, or even
survive, and no reason to continue acting towards a civilized society. The complete lack
of births worldwide might easily result in a dystopian society such as the one in
The Children of Men. Today, world birth rates have dropped on
average since 1950, and are predicted to continue dropping. Since the world population
is over seven billion, some analysts have predicted that the world's resources will no
longer be able to sustain the population if birth rates remained stable. The drop in
birth rates can be attributed to a great number of factors, such as reliable birth
control and social awareness. In The Children of Men, births
stopped entirely, and the result was that civilized society began to break down; this is
not seen directly in modern society, but many people believe that modern society is
reverting to a less-enlightened age and to a more violent common mindset. It is
possible, through statistical analysis, to relate violence and the collapse of society
to lowering birth rates; more and more people believe that there is no future to work
toward, and so their actions have no moral meaning.