no one is ever untrammeled, private, alone—and therefore all the more interesting to me.

why all the more interesting? (asked not belligerently, but in curiosity)

For myself, I can see how this would be true simply because most of our lives, we're interacting with people; mainly we don't have the privilege of being untrammeled and alone--and also because drama and story are often (but not always) more intense when they involve more than one person.

But how about you, why for you?