The missing part is... those are Valentino's, those are not "Tennis shoes". Now, why did someone throw out those Valentino's? Because nobody who goes to college and wears Valentino would wear those Valentino's, those particular Valentino's pictured, to someone who likes Valentino: are garbage. To your second point, why not give them to someone with less? I would suspect that a young person who is attending Duke University, one of the most exclusive universities in the world, wearing Valentino, a luxury brand that even people who love luxury brands laugh at, gives oh about...mmm.. zero shits for someone who has less than them. Third, you referenced a society that has a sense of egalitarianism, I'd hazard: that society is far removed from the above realities.