^ Except that Q has never acted that way. Q has, from the beginning, acted as though humans carry a special interest for him, and that our heroes -- particularly Picard -- carry a special interest. Q even told Picard, in what seems to be a moment of truth, that he is the closest thing he has to a friend. He cared about Picard enough to teach him a valuable lesson in "Tapestry," one which Picard said he owed Q a debt of gratitude for. And he cared enough about humanity as a whole to help Picard when the Continuum was apparently content to see them destroyed in "All Good Things..."
It may not make sense when you think about the lifespan of the Q and what their attitude toward humans should be. But the on-screen evidence seems clear that Q is very interested in and concerned about humanity in general and Picard in particular.