kvinneakt, I was struck reading your post by a feeling of deja vu and decided I believe we think about those things that are most useful or problematic to us and that that is a good thing. Something about your son and his way of life may fascinate you yourself, in the sense that you wonder what you would do with aspects of his life. I'm probably just reading myself into it but your son sounds brave to me; I wouldn't be able to live itinerantly, on the street, I don't think. Wondering how such people live, what they think, how they feel, what they worry about, would consume my thinking if I knew someone, had a child like that, living in that fashion.

I am reminded too, of the recommendations by professional jingle writers for when one gets a song stuck in one's head; either sing the song through to its end (to get closure) or replace it with a different song. Were I you I would figure out what I get from thinking about my son in my spare time, what interest it gives me or what else it keeps me from thinking about/replaces in my own life or I would merely find another "interest" and keep bringing my thinking to that whenever you find it straying to your son and don't wish it to. What other "hobbies" do you have?