The author's premise is that when people interact, 'structures' always form (it's in the same section you quoted from). It's same way that one could argue that

The author's premise is that when people interact, 'structures' always form (it's in the same section you quoted from). It's same way that one could argue that 'politics' is always present, when two or more people must work together. You can't really claim her assertion isn't true simply by using your own definition of the term.