SV and SF techies hate the homeless b/c they think they are all self-made. They walk out of Philz with their $4 coffee, look down at a bum, and think to themselves "Why doesn't he learn Ruby on Rails and become YCombinator millionaires like us?" At least in "third world" countries cited by the author, the wealth disparity is much older and there is a social contract between the serfs and lords.