I doubt most drug addicts grow up saying "I want to be a drug addict". Makes zero difference to me - if someone's a threat to me, or my business, or especially to my wife - I don't even view them as human.I don't believe that anyone is born with the attitude that "When I grow up, I want to be homeless".
My experience is that addiction or mental illness aside, pretty much all homeless people ended up on the street because of circumstances not always their fault (laid-off, gentrification, domestic violence, etc.) or because of wrongful decisions (debt, associations, etc.) and most that I met were eager to work their way out of homelessness, if possible. I almost never met anyone that wanted to live that way.